Willis Pendulum Astrolabe

Title

Willis Pendulum Astrolabe

Subject

Astronomy
Navigation
Surveying
Optical instrument
Measuring instrument

Description

The Willis Pendulum Astrolabe was used primarily by the armed forces to determine latitudes and longitudes. The astrolabe is stored in a large green wooden box. It is marked “PENDULUM ASTROLABE David White Co. Milwaukee Wisc USA, No. 65649, M-5107, 1952, U.S.” The instrument was invented by John Willis> The advantage of the Willis pendulum was that it used a mirror instead of mercury as a reflecting surface. It was able to measure position on earth to within 20 feet. The David White Company was founded in 1895 and continues to provide precision optical tools used in surveying.

Creator

David White Company

Publisher

University of Illinois, Astronomy Department, Urbana

Date

Circa 1952

Contributor

Michael Svec

Rights

Copyright Michael Svec

Format

image/jpg

Language

English

Type

physical object

Coverage

University of Illinois Observatory, Urbana, Illinois

Files

Willis Pendulum Astrolabe
DSCN0396.JPG

Citation

David White Company, “Willis Pendulum Astrolabe,” University of Illinois Observatory Collection, accessed December 16, 2017, http://uiobservatory.omeka.net/items/show/63.

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