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 .05(“mu symbol”)v/mm”, “C.D.R.X. 10(Ohm Symbol)”, “PERIOD 6.2 sec”, “RESIST 15.2(Ohm Symbol)”. On the metal base there is an etching that reads “346666”.
The main cylinder of the instrument emerges from the centre of the base. On one side, it has a rectangular opening which is covered in glass held on with a metal surround screwed to the cylinder. Visible behind this is the galvanometer mechanism and a small circular mirror attached to a fine a vertical wire. In front of this window, affixed to the base, there are two electrical terminals topped with plastic screw caps. On top of the cylinder there is a brass knob with the following labels “Made in U.S.A”, “Zero Adjuster”, “Coil Clamp”.
Accession Number: 2009.ph.178
Alternative Name: Type R
Primary Materials: Metal, Plastic, Glass
On the metal base there is an etching that reads “346666”. 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 is engraved “5040”.
Dimensions (cm): Height = 22cm, Diameter = 13cm
Leeds & Northrup Co. Philadelphia, Pennsylvania, USA.
Date of Manufacture: 20th Century
Provenance: Collection of Dr. Martin Lee.
Additional Information and References: