Galvanometer image from PD book: Electrical Measurement and the Galvanometer: Its Construction and Uses, by T. D. Lockwood, New York: J. H. Bunnell and Co., 1890.
== Summary == Image from PD book: Electrical Measurement and the Galvanometer: Its Construction and Uses, by T. D. Lockwood, New York: J. H. Bunnell and Co., 1890. == Licensing == {{PD-US}} == Original upload history == This file was originally uploaded