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Voltmeter 420

0-10 Volts DC Model 420

Oelke Grinnell Potentiometer

Designed by Professor William Oelke, Grinnell College Chemist

Decade Condenser

Type 219-M

Radio Condenser

Wm. J. Murdock Co., No. 483

Galvanometer

A galvanometer is a device for detecting electric current. The galvanometer pointer deflection is from electric current passing through a coil immersed in a magnetic field.