Probably the Brooks Model 7 Deflection Galvanometer, described in Leeds and Northrup's Bulletin no. 763. Serial no. 113760. With Weston Electric galvanometer, model 440. Mfg: Leeds and Northrup Co., Philadelphia, PA.
Materials from the Caltech Archives are made available online for research purposes. Permission for reproduction, distribution, public display, performance, or publication must be obtained in writing from the Head of Archives. The Caltech Archives makes no representation that it is the copyright owner in all of its holdings. It is the responsibility of the user to obtain all necessary rights and clearances for use of materials. For questions, contact Head of Archives.