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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Time
Description
An account of the resource
One of the oldest responsibilities of an astronomer was the measurement of time. Before telegraph and radios, each observatory had special equipment and clocks for the precise determination of local solar and local sidereal time. These clocks were much more precise than the typical pendulum clocks found in the home. This collection contains the clocks, time recording devices and weather instruments necessary for the accurate measurement of the local time.
Contributor
An entity responsible for making contributions to the resource
Department of Astronomy
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
2-day Marine Chronometer
Subject
The topic of the resource
Astronomy
Clocks
Description
An account of the resource
Mahogany wood, brass, silver, glass
Chronometer of 56-hour duration is set in gimbals in a mahogany box. Serial number #2805. John Bliss and Company was active 1857-1956.
Marine chronometer within wood box with hinged lid measuring 7-inches by 7-inches by 7-inches. Includes a label with University of Illinois in script. A pendulum clock would not work well on an ocean vessel. Knowing the time to within a second was critical for marine vessels to determine their position and navigate. A 19th century marine chronometer used a balance wheel to regulate the time. In addition they were gimbaled within the box to counter the movement of the ship.
A photograph from Oct 5, 1957 shows a box chronometer sitting next to radio receiving equipment that was being used to track Sputnik. Unknown which chronometer but it shows that at least one existed until 1957. Stebbins listed as worth $50 in 1908.
Creator
An entity primarily responsible for making the resource
John Bliss & Company, New York
Source
A related resource from which the described resource is derived
Harvard has an example, serial number 2620 dates 1880s at http://waywiser.fas.harvard.edu/objects/2763/56hour-marine-chronometer
Publisher
An entity responsible for making the resource available
Astronomy Department, University of Illinois, Urbana, Il
Date
A point or period of time associated with an event in the lifecycle of the resource
Circa 1885
Contributor
An entity responsible for making contributions to the resource
Michael Svec
Rights
Information about rights held in and over the resource
copyright Michael Svec
Language
A language of the resource
English
Type
The nature or genre of the resource
physical object
Identifier
An unambiguous reference to the resource within a given context
University of Illinois Observatory Collection A128
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
University of Illinois Observatory, Urbana, Illinois
chronometer
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Haines small Sidereal Clock
Creator
An entity primarily responsible for making the resource
Haines
Format
The file format, physical medium, or dimensions of the resource
Image
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Large Haines Sidereal clock, 8-inch dial
Contributor
An entity responsible for making contributions to the resource
Michael Svec
Format
The file format, physical medium, or dimensions of the resource
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Haines Sidereal clock, 8-inch dial
Format
The file format, physical medium, or dimensions of the resource
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Haines Sidereal clock, 8-inch dial, interior.
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Time
Description
An account of the resource
One of the oldest responsibilities of an astronomer was the measurement of time. Before telegraph and radios, each observatory had special equipment and clocks for the precise determination of local solar and local sidereal time. These clocks were much more precise than the typical pendulum clocks found in the home. This collection contains the clocks, time recording devices and weather instruments necessary for the accurate measurement of the local time.
Contributor
An entity responsible for making contributions to the resource
Department of Astronomy
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Cabin sidereal clock
Subject
The topic of the resource
Astronomy
Clocks
Description
An account of the resource
Aluminum, brass, glass
There are two sidereal clocks, both are electric. The first is 9 ½-inch diameter with a 8-inch dial, black metal base, brass and glass, 3 hands.
The second smaller clock 5 ¼-inch diameter, tag indicates a date of 1966.
A 1953 ad shows the electric sidereal clock with a rating of less than one minute slow in 16 years. Cast aluminum case with bronze bezel for $40.
Creator
An entity primarily responsible for making the resource
Haines Scientific Instruments, Englewood, New Jersey
Publisher
An entity responsible for making the resource available
Astronomy Department, University of Illinois, Urbana, Illinois
Date
A point or period of time associated with an event in the lifecycle of the resource
about 1966
Contributor
An entity responsible for making contributions to the resource
Michael Svec
Rights
Information about rights held in and over the resource
copyright Michael Svec
Format
The file format, physical medium, or dimensions of the resource
image/jpg
Language
A language of the resource
English
Type
The nature or genre of the resource
physical object
Identifier
An unambiguous reference to the resource within a given context
University of Illinois Observatory Collection A225.1, A225.2
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
University of Illinois Observatory, Urbana, Illinois
clock
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The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Warner & Swasey drum chronograph
Rights
Information about rights held in and over the resource
Copyright Michael Svec
Format
The file format, physical medium, or dimensions of the resource
image/jpg
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Time
Description
An account of the resource
One of the oldest responsibilities of an astronomer was the measurement of time. Before telegraph and radios, each observatory had special equipment and clocks for the precise determination of local solar and local sidereal time. These clocks were much more precise than the typical pendulum clocks found in the home. This collection contains the clocks, time recording devices and weather instruments necessary for the accurate measurement of the local time.
Contributor
An entity responsible for making contributions to the resource
Department of Astronomy
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Drum chronograph
Subject
The topic of the resource
Astronomy
Clocks
Measuring instrument
Time recording device
Furniture
Description
An account of the resource
Metal, wood, glass
The chronograph, made by Warner and Swasey, is permanently mounted in the clock room. Includes wooden box (9 ¼ x 6 ¼ x 50 ¾ inches) connected to counter-weights and pulleys attached to the ceiling. It consists of a brass cylinder 7-inches in diameter and 14-inches long onto which paper is attached. The driving mechanism is housed to the immediate left of the cylinder. The driving mechanism consists of a spinning governor for regulation and weights to provide the power. A pen is carried on the armature of an electromagnet through which, when current flows, makes a tick mark on the rotating paper. It is possible to measure the time and duration of an event to a hundredth of a second accuracy (depending on how accurately the clock is set).
The weight driven gears still work although the system needs cleaning. The armature and drum still work. The paint on the chronograph is cracking.
The chronograph is connected to the Observatory’s clocks, which provide tick marks every second, and to a key, usually by a transit telescope. An astronomer hits the key when an event occurs and a tick mark is left on the paper with the second tick marks. By recording events this way astronomers can concentrate on the telescope observations and can read the times from the paper at a more convenient time. The chronograph continued to be use in association with the clocks through the 1960s for timing lunar occultation’s and transits.
Creator
An entity primarily responsible for making the resource
Warner & Swasey Company
Source
A related resource from which the described resource is derived
Todd, David P. (1897) A New Astronomy. American Book Company: New York. Page 213.
Publisher
An entity responsible for making the resource available
Astronomy Department, University of Illinois, Urbana, Illinois
Date
A point or period of time associated with an event in the lifecycle of the resource
1896
Contributor
An entity responsible for making contributions to the resource
Michael Svec
Rights
Information about rights held in and over the resource
Copyright Michael Svec
Format
The file format, physical medium, or dimensions of the resource
image/jpg
Language
A language of the resource
English
Type
The nature or genre of the resource
physical object
Identifier
An unambiguous reference to the resource within a given context
University of Illinois Observatory Collection A116
University ID 016668, obs36
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
University of Illinois Observatory, Urbana, Illinois
chronograph
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The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
IBM master clock
Rights
Information about rights held in and over the resource
Copyright Michael Svec
Format
The file format, physical medium, or dimensions of the resource
image/jpg
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The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Time
Description
An account of the resource
One of the oldest responsibilities of an astronomer was the measurement of time. Before telegraph and radios, each observatory had special equipment and clocks for the precise determination of local solar and local sidereal time. These clocks were much more precise than the typical pendulum clocks found in the home. This collection contains the clocks, time recording devices and weather instruments necessary for the accurate measurement of the local time.
Contributor
An entity responsible for making contributions to the resource
Department of Astronomy
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Master clocks
Subject
The topic of the resource
Astronomy
Clocks
Measuring instrument
Description
An account of the resource
Wood, glass, metal
They are model 25 IBM Master clocks. There are two 60 beat with a Graham dead-beat escapement with micrometer adjustment. Magnet wound, spring drive, self-regulating movement, 63 1/6” x 19 ¼” x 7 5/8”, plain glass door, 12” Arabic dial, white with black numbers, separate hours and smaller seconds circle. There is a one second switch as well as a 59 second switch. Pendulum is a mercurial compensating pendulum, 45 5/16 inches long and approximately 11.5 pounds, accurate to 10 seconds over a 30-day period. The standard time clock has the original mercurial pendulum with two cylinders. The sidereal clock pendulum is a replacement Invar pendulum with one cylinder. Clocks are automatically wound with reserve power for approximately 12 hours. Clocks are housed in a walnut wood case with a glass door and two locks.
A=central standard time (south side of pier), B=local sidereal time (east side of pier). Clock serial numbers are 462905 and 462904.
Included in the purchase order was the new switching wiring and metal storage cabinet and control panel outside the clock room. Paper instructions included.
These clocks replaced the original 1896 Clemens Riefler clocks both of which are now part of the Alder Planetarium collect.
Creator
An entity primarily responsible for making the resource
IBM
Publisher
An entity responsible for making the resource available
Astronomy Department, University of Illinois, Urbana, Illinois
Date
A point or period of time associated with an event in the lifecycle of the resource
1954
Contributor
An entity responsible for making contributions to the resource
Michael Svec
Rights
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Copyright Michael Svec
Format
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image/jpg
Language
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English
Type
The nature or genre of the resource
physical object
Identifier
An unambiguous reference to the resource within a given context
University of Illinois Observatory Collection A211.1, 211.2
University ID 196631A, 196631B
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
University of Illinois Observatory, Urbana, Illinois
clock
-
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Title
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Green Mercury Stick barometer
Rights
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Copyright Michael Svec
Format
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image/jpg
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Title
A name given to the resource
Time
Description
An account of the resource
One of the oldest responsibilities of an astronomer was the measurement of time. Before telegraph and radios, each observatory had special equipment and clocks for the precise determination of local solar and local sidereal time. These clocks were much more precise than the typical pendulum clocks found in the home. This collection contains the clocks, time recording devices and weather instruments necessary for the accurate measurement of the local time.
Contributor
An entity responsible for making contributions to the resource
Department of Astronomy
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Mercury stick barometer
Subject
The topic of the resource
Astronomy
Weather instrument
Barometer
Measuring instrument
Description
An account of the resource
Wood, metal, glass, mercury
Housed in wooden box with glass sides, hinged wood/glass door, case is 9 ¼ x 6 ¼ x 50 ¾ inches. Originally kept in the entrance hall on the west wall, just north of the door to the transit rooms. Glass on front door broken.
Consists of mercury in a glass tube encased by chrome and brass tube. Provided with two scales read with a vernier to 0.002 of an inch and 0.05 mm. Range is 66 mm to 83 mm and 26 in to 32.5 in. Vernier moved by turning an attached wheel. Thermometer mounted on barometer measures temperature of the mercury in Centrigrade. Barometer is 45 inches long. Suspended to Mahogany board by a hanger at the top with steadying screws at the bottom cistern. White opal glass plates attached to board for reading the instruments. Inscribed on cistern with “Henry J. Green, New York,” the number 3603 on thermometer and number 3138 on the mercury scale.
The barometric pressure and the temperature were two important factors in determining the atmosphere’s index of refraction. The index of refraction was necessary for transit observations.
Creator
An entity primarily responsible for making the resource
Henry J. Green & Company, New York
Publisher
An entity responsible for making the resource available
Astronomy Department, University of Illinois, Urbana, Illinois
Date
A point or period of time associated with an event in the lifecycle of the resource
1896
Contributor
An entity responsible for making contributions to the resource
Michael Svec
Rights
Information about rights held in and over the resource
Copyright Michael Svec
Format
The file format, physical medium, or dimensions of the resource
image/jpg
Language
A language of the resource
English
Type
The nature or genre of the resource
physical object
Identifier
An unambiguous reference to the resource within a given context
University of Illinois Observatory Collection A129
University ID 016673, obs79
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
University of Illinois Observatory, Urbana, Illinois
barometer
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Title
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Model EC 1 Echophone
Rights
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Copyright Michael Svec
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image/jpg
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Time
Description
An account of the resource
One of the oldest responsibilities of an astronomer was the measurement of time. Before telegraph and radios, each observatory had special equipment and clocks for the precise determination of local solar and local sidereal time. These clocks were much more precise than the typical pendulum clocks found in the home. This collection contains the clocks, time recording devices and weather instruments necessary for the accurate measurement of the local time.
Contributor
An entity responsible for making contributions to the resource
Department of Astronomy
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Radio receiver
Subject
The topic of the resource
Astronomy
Clocks
Electrical apparatus
Radio
Description
An account of the resource
Metal, glass
In 1914, the Observatory was connected to a wireless apparatus to receive radio time signals. The apparatus consisted of one wire 650 feet long stretching from the Observatory to the Auditorium to Lincoln Hall. In 1964, the antenna ran from the clock room to Smith Hall and was 67 feet long. Used for timing lunar occultations in the 1950s.
Ron Schorn (2015) described the clock room (as a graduate student his office consisted of a desk by the window in the clock room) and the radio in 1958. “One of my jobs was to regulate the clocks, for which purpose there was an AM/FM/shortwave radio on a small shelf above and to the right of my desk to receive WWV time signals, but also helped while away the nighttime hours . . . The radio in the clock room, which received AM and FM as well as several short wave bands, was on a good deal of the time, especially at night. The small window between the chronograph and the transit usually was open, and the unusual geometry of that part of the building was such that programs were about as audible to Ray as to myself {Note: Ron’s office was in the clock room, Ray White’s office was in the transit room}. On short wave we could always tune in to The Voice of America (on many, many frequencies), the BBC, or Radio Nederland, but the most fun was listening to Radio Moscow. The Red Show had lightened up since Stalin’s death (No longer did it play only Tchaikovsky or Swan Lake), but it was hilarious to follow their “centrally directed” attempts to be “modern” and impress Western listeners. On the AM band, the favorite program before midnight was Herbert W. Armstrong offering “The Plain Truth about the World Tomorrow!” Namely that the Second Coming was due any day now. . .
“From about 11:30 PM to 5:30 AM or so the favorite program by far was “Music “til Dawn.” This was a network of separate but similar classical-music programs sponsored by American Airlines on various clear channel stations across the USA: Denver, Dalas, and so forth. These were extremely popular at observatories nationwide and we listened to Jay Andres on WBBM in Chicago. In those days Jay gave the sighting times of visible satellite passages, which we then went out and watched if skies were clear.
“One curious and even memorable event involved daytime use of the clock radio. It happened while Sydney Chapman was visiting the Observatory. He was the head of the entire International Geophysical Year effort, and happened to be standing in my office to listen to the live broadcast of the first attempt to launch a Vanguard satellite. Famously, the launch vehicle slowly fell back on the launch pad, broke up, and exploded.”
The receiver was cleaned and repaired in 2017 by Bob Hoffswell.
Creator
An entity primarily responsible for making the resource
Echophone Radio Corporation, Chicago, Illinois
Publisher
An entity responsible for making the resource available
Astronomy Department, University of Illinois, Urbana, Illinois
Date
A point or period of time associated with an event in the lifecycle of the resource
circa 1950
Contributor
An entity responsible for making contributions to the resource
Michael Svec
Rights
Information about rights held in and over the resource
Copyright Michael Svec
Format
The file format, physical medium, or dimensions of the resource
image/jpg
Language
A language of the resource
English
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
University of Illinois Observatory, Urbana, Illinois
Type
The nature or genre of the resource
physical object
radio receiver
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Title
A name given to the resource
Self winding clock
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The file format, physical medium, or dimensions of the resource
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The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Time
Description
An account of the resource
One of the oldest responsibilities of an astronomer was the measurement of time. Before telegraph and radios, each observatory had special equipment and clocks for the precise determination of local solar and local sidereal time. These clocks were much more precise than the typical pendulum clocks found in the home. This collection contains the clocks, time recording devices and weather instruments necessary for the accurate measurement of the local time.
Contributor
An entity responsible for making contributions to the resource
Department of Astronomy
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Self winding clock
Subject
The topic of the resource
Astronomy
Clocks
Measuring instruments
Description
An account of the resource
Wood, metal, glass
Purchased by the Astronomy Club in 1985 at an estate sale, the clock was missing the dial and door but still retained the wooden case, paper instructions, wires, hands, pendulum, and clock mechanism. In 2011, Dr. Bruce Hannon restored the clock adding a replacement door and dial, and updating the battery connections. During the restoration he discovered the pendulum regulating solenoid was missing. Serial number engraved on the clock mechanism is 112040. Dates to 1917.
Self Winding Company clocks were accurate spring-driven, pendulum regulated, clock. Batteries powered an electromagnetic winding mechanism. In addition, a signal from an external source, usually Western Union telegraphic signals, helped regulate the pendulum keeping the time in synchronization with a standard clock. Western Union received the time signal from the US Naval Observatory. The pendulum movement is accurate to an error less than 1 minute per week, so the Western Union telegraphic signal could correct and eliminate the error.
Creator
An entity primarily responsible for making the resource
Self Winding Clock Company, New York
Publisher
An entity responsible for making the resource available
Astronomy Department, University of Illinois, Urbana, Illinois
Date
A point or period of time associated with an event in the lifecycle of the resource
circa 1917
Contributor
An entity responsible for making contributions to the resource
Michael Svec
Rights
Information about rights held in and over the resource
Copyright Michael Svec
Format
The file format, physical medium, or dimensions of the resource
still image of artifact
Language
A language of the resource
English
Coverage
The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant
University of Illinois Observatory, Urbana, Illinois
Type
The nature or genre of the resource
physical object
clock
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Time
Description
An account of the resource
One of the oldest responsibilities of an astronomer was the measurement of time. Before telegraph and radios, each observatory had special equipment and clocks for the precise determination of local solar and local sidereal time. These clocks were much more precise than the typical pendulum clocks found in the home. This collection contains the clocks, time recording devices and weather instruments necessary for the accurate measurement of the local time.
Contributor
An entity responsible for making contributions to the resource
Department of Astronomy
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Sidereal clock, no. 22
Subject
The topic of the resource
Astronomy
Clocks
Measuring instruments
Description
An account of the resource
Wood, metal, glass
Wooden mahogany case, there was a spare wooden case, height 59.25 cm, width 44 cm, depth 20 cm. There are two front glass doors, one for the dial and one for the pendulum. The sides are wood paneling for the pendulum and glass for the top portion showing the mechanism. Details on Riefler clocks can be found on page 36 of this catalog. On the left of the dial it reads; “C Riefler, DRP No 50739 no 22” and on the right side of the dial “Munchen DRP No 60059 1896.” The number DRP 50739 is the German patent number for the escapement and DRP 60059 is the German patent number for the mercury compensating pendulum. The pendulum consisted if a steel tube filled 2/3 with mercury and a thin steel bob weighing several kilograms. The dial for the large hand is for minutes. The top smaller dial is for seconds marked in 0-60. The bottom dial is for hours, marked 1-12 in roman numerals.
The clock is now in the collection of the Adler Planetarium in Chicago
"The Riefler clock has two interesting characteristics. The first consists in the peculiarly simple and effective compensating pendulum, and the second in the mode of suspending the pendulum.
“As is well known, any good compensating pendulum should have as few parts as possible, should take up changes of atmospheric temperature with equal rapidity in all its parts, should have its compensating material extending as nearly throughout the length of the pendulum as possible, and finally should be heavy and have an appropriate form. How nearly Riefler's pendulum satisfies these conditions can be inferred from the following description:
“Its consists of a hollow steel tube 4 ft. 2 in. long, 0.65 of an inch inside diameter, with its wall 0.04 an inch thick. The tube is filled with mercury to a height of about two-thirds of its length. At the lower end is attached, by a screw with a milled head, a heavy lens-shaped mass of brass whose form permits it to cut its way through the air with almost no resistance. Below the lens are smaller disk-shaped masses whose number and position may be varied for somewhat finer regulation of the rate than can be effected with the milled head. These disks are also used for regulating either to sidereal or mean solar time. At about two-thirds of the height of the pendulum is a light brass cup for the reception of small weights that may be put on or taken off for the most delicate alterations or rate, without disturbing the vibrations of the pendulum.
“The second special feature is the peculiar mode of suspending the pendulum. Its weight is carried by a frame resting by knife edges on agate surfaces. By means of a pair of thin steel springs the two parts into which the pendulum tube is divided near its point of suspension are connected at a distance about one-half inch apart. Through these springs the oscillations of the pendulum communicate a rocking motion to the frame and also to an arm extending downward, terminating in a fork either prong of which carries an agate pin. These pins engage alternately into the tooth wheel of the escapement. The rest of the mechanism of the escapement offers no features especially different from the ordinary form. By means of a pair of screws at the extreme top of the pendulum, the relative lengths of to and fro vibrations may be regulated. The clock is also provided with break circuit attachments and chronographic connections."
The first Riefler clock was designed in 1890 in consultation with Hugo von Seeliger, director of the Munich Observatory. Professor G.W. Myers did his dissertation research under Seeliger in Munich between 1894 and 1896. By 1900, 230 of the mercury compensation pendulums had been sold.
Creator
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Clemens Riefler of Munich, Germany
Source
A related resource from which the described resource is derived
Myers, George W. "The Astronomical Observatory of the University of Illinois." Popular Astronomy. 6 (1898) 319-321.
Special catalogue of the joint exhibition of German mechanicians and opticians. (1900). Berlin: Reichsbruckerei.
Publisher
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Adler Planetarium, Chicago, Adler: Accession number A-189
Date
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1896
Format
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graphic image from catalog
Language
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English
Coverage
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University of Illinois Observatory, Urbana, Illinois
Type
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physical object
clock