This is a black instrument which stands on three adjustable screw legs with plastic feet. The instrument is cylindrical, with an broader round base. On the underside of the circular base there is a oval plastic attachment with labels “SENS .10(“mu symbol”)v/mm”, “C.D.R.X. 20(Ohm Symbol)”, “PERIOD 6.9 sec”, “RESIST 18.3(Ohm Symbol)”. This can be rotated to view the label, or tucked away out of sight.
The base has two electrical terminals and a metal cylinder attached to it. Along the length of the cylinder there is a glass window through which a mirror attached to loose copper wires can be seen. On the top of the cylinder there is a brass knob with the following labels “Made in U.S.A”, “Zero Adjuster”, “Coil Clamp”. The top of the device has circular inset section with screws screwed into it. Also engraved by hand on the top is “1812” and “Low Temperature”. On the back right of the cylinder near the base is a horizontal adjuster knob.
Accession Number: 2009.ph.177
Alternative Name: Type R Galvanometer
Primary Materials: Metal: Iron Alloy, Plastic, Glass
Old inventory number = phy362. On the metal base there is an etching that reads “732057”. On the top of the cylinder there is a brass knob with the following labels “Made in U.S.A”, “Zero Adjuster”, “Coil Clamp”. Also engraved on the top is “1812”.
Dimensions (cm): Height = 22cm, Diameter = 13cm
Galvanometers are used to measure small changes in electrical current.
Very Good: The case of the instrument is in very good condition with very few marks or scratches, although it is quite dusty. The adjuster section on the top of the case is somewhat oxidized. The interior mechanism also appears in good condition. The small mirror an attached wire is resting in a lax position, but this may be because it has been adjusted for storage.
Leeds & Northrup Co. Philadelphia, PA.
Date of Manufacture: Mid 20th Century, c. 1930-1970
Provenance: Collection of Dr. Martin Lee
Additional Information and References: