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break-circuit relay and switch for astronomical regulator

break-circuit relay and switch for astronomical regulator

Harvard College Observatory
circa 1869
electromagnetic relay

electromagnetic relay

J. H. Bunnell & Company
circa 1880
electromagnet with ratchet mechanism

electromagnet with ratchet mechanism

American
1890-1920
Image Not Available

Four-relay module

Department of Psychology, Harvard University
circa 1959
Image Not Available

latching relay module

B. F. Skinner
1950-1955
relay

relay

American Telephone and Telegraph Company
circa 1904
sensitive DC relay, Weston model 30

sensitive DC relay, Weston model 30

Weston Electrical Instrument Corporation
circa 1912
standard galvanometer relay

standard galvanometer relay

Weston Electrical Instrument Corporation
circa 1920
standard galvanometer relay

standard galvanometer relay

Weston Electrical Instrument Corporation
circa 1920
telegraphic relay

telegraphic relay

Signal Electric Manufacturing Company
1919-c1940
telegraph relay

telegraph relay

Leach Relay Company
circa 1930
telegraph relay

telegraph relay

American
1890-1920
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The Collection of Historical Scientific Instruments
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