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.
Weston Electrical Instruments Company, New, New Jersey
Astronomy Department, University of Illinois, Urbana, Illinois
Copyright Michael Svec
University of Illinois Observatory Collection A193
University of Illinois Observatory, Urbana, Illinois
Weston Electrical Instruments Company, New, New Jersey, “Reflection galvanometer,” University of Illinois Observatory Collection, accessed November 19, 2017, http://uiobservatory.omeka.net/items/show/20.