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> Leeds & northrup galvanometer - oklahoma state univ.
Leeds & northrup galvanometer - oklahoma state univ.
Museum quality near-perfect reflecting galvanometer. Original equipment in the lab at "Old Central" - the first building of Oklahoma Agriculture and Mechanical College (Oklahoma A & M) and later renamed Oklahoma State University.
Here's a description taken from The Powerhouse Museum in Australia, describing galvanometers in general, and this piece specifically. I hope they don't mind. It seems like a great place. They seem like nice people. Here's what they have to say about theirs:
Galvanometer - reflecting D'Arsonval type, metal / wood / plastic / glass, made by Leeds & Northrup, Pittsburgh, Philadelphia (1938-1946).
This is a portable, D-Arsonval type moving coil reflecting galvanometer, contained in a beautiful wooden box, with two sets of terminals mounted on the exterior of the box, two for connection of a 6-volt AC or DC power source, and the other two for test connection. The top of the box hinges back to show a horseshoe magnet lying horizontally. The galvanometer system is a light coil assembly with a pivotable mirror suspended between the poles of the horseshoe magnet.
A galvanometer is an instrument for detecting and measuring electric current. It is an electromechanical transducer that produces a rotary deflection through a limited arc in response to electric current flowing through its coil.
The first galvanometer was built in Germany by Johann S. Schweigger in 1820. It is a device used to measure low-level electric currents by electromechanical action. A mirror galvanometer is a mechanical meter that senses electric current, except that instead of moving a needle, it moves a mirror. In the D'Arsonval design the coil has many turns of fine wire, and is suspended by a flat ribbon of wire which serves as one lead-in wire.
D'Arsonval type galvanometers operate by means of a light coil of wire being suspended from a metal ribbon a few thousandths of a millimetre wide and less than 0.02mm thick. The light system comprises a lamp, lamp-holder and lens assembly. Mirror and light assembly operate in the same plane, to reflect the light beam on to a frosted glass panel on the front inside of the box. The glass panel is marked with a scale graduated in millimetres. The coil, which can freely rotate between the permanent magnet poles carries the small mirror which acts as the optical pointer, showing the coil position. Current is conducted to and from the coil by the suspension ribbons.
Cat. no. 2420 - Serial # 765416
Even if you (like us) know nothing about galvanometers... this is a fantastic looking antique piece - well worth the investment. Maybe you're a just good old OSU alumnus who would like to own a piece of history.
