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University of Illinois Observatory Collection
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Eyepiece with crosshairs, 12-inch tall, 11-inch long, tube 1-inch outer diameter, missing an objective lens.
Used with galvanometer to read the reflection off the mirror.
Model no. 89, no. 18. Box is 8 ¼ x 8 ½ x 12 inches and screwed closed. Unknown date but estimated around 1920-1925 although could be earlier. Used with the selenium cell photometer to measure current and with the photoelectric cell photometer.