Accession Number: 2009.ph.177
A circular base with 3 height adjustable knobs at the bottom and on the bottom of the circular base there is a movable 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)”. 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 meter attached to 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 is missing the usual adjuster knob. Also engraved on the top is “1812” and “Low Temperature”. On the back right of the cylinder near the base is a horizontal adjuster knob; purpose unknown.
Alternative Name: Type R
Primary Materials: Metal, 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
2009.ph.10; 2009.ph.176; 2009.ph.178; 2009.ph.21; 2015.ph.638; 2015.ph.664; 2015.ph.665
Manufacturer: Leeds & Northrup Co. Philadelphia, PA.
Date of Manufacture: 20th Century
Provenance: Collection of Dr. Martin Lee