Images(4)

standard galvanometer relay

Datecirca 1920

Inventory Number0540

ClassificationRelay

Subject

Maker Weston Electrical Instrument Corporation founded 1888

Maker Department of Physics, Harvard University founded 1884

Cultural Region

Place of Origin

Place of Use

Dimensions8.3 × 20.8 × 9.7 cm (3 1/4 × 8 3/16 × 3 13/16 in.)

Material

DescriptionThe different components of this object are all affixed to a tall rectangle. Along the top and the bottom are binding posts -- three at the top, two at the bottom -- featuring labels such as "M.C. -", "M.C. +" or "L.C. LOW". The major components of the device are enclosed in an arch-shaped case. Closer to the top of this case is a faceplate. Closer to the bottom is a circular window, allowing the user to see the major mechanical component. Once the case is opened, one sees that five different wires emanate from the main component and run through the rectangular backing (presumably to the binding posts).

Signedon faceplate: WESTON ELEC INST. CORP / NEWARK N.J. USA

Inscribedon faceplate: D.C. CURRENT RELAY / MODEL 30 No 13785 / RANGE IN MILLIAMPS / LOW ____ HIGH _____ / ___________ / PATENTED NOV _ __ JUL __ ___

Curatorial RemarksSimilar to 0532. "Apparently unaltered as issued (unimproved by experts)".

FunctionThis device can be used to open or close a circuit under predetermined conditions in another circuit.

ProvenanceFrom the Department of Physics, Harvard University.