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Accession number 1996.4
Object ID 1996.4.6
Object Name Relay
Collection Object/Artifact Collection
Date 1916
Description Cylindrical relay with cast iron body and cylindrical glass case; relay with visible internal components and "vane". Probably Union Switch & Signal Co.; US&S inspectors tag dated 8/24/16. Likely an A/C track or line relay. Connects subway signals with the tracks sections they control. It detects oncoming trains & automatically changes signal lights. Relays also send train location & switch positions to the signal tower, enabling the tower operator to control some of the signals.
Cylindrical glass case with manufacturer name etched into the glass; inspector's paper tag glued to interior of cast iron base; visible electrical components include large black coils, magnetic contacts and vane mechanism; cast iron, circular contact board on top of relay; contact board with twelve contacts; each contact is a threaded bolt with a white plastic disc, inscribed with the contact number.

Manufacturer Union Switch & Signal Co.
Maker Union Switch & Signal Co.
Maker's Role Manufacturer
Place of Origin Swissvale, PA
Dimension Details 10-in. OH x 8-in. Od x 2 ft. 1 in. OC
Material Glass/Cast iron/Plastic
People/Corporations Union Switch & Signal Co.
Subjects Subways--New York (State)--New York--History.
Subways--Electric equipment--New York (State)--New York.
Search Terms Relay
Number of images 3.0