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ADT 400-4 Relay Sprinkler Supervisory Transmitter.

ADT 400-4 Relay Sprinkler Supervisory Transmitter.

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Usage conditions apply
Description (Brief)
ADT 400-4 Relay Sprinkler Supervisory Transmitter. Four relay coils and 4 clock drives in wood case with hinged cover; holes with wires protruding in hollow of base. Western Union and ADT (American District Telegraph) markings on label.
Currently not on view
Object Name
Box, Control
alarm transmitter
Physical Description
wood (overall material)
metal (overall material)
overall: 14 1/2 in x 20 1/2 in x 6 1/2 in; 36.83 cm x 52.07 cm x 16.51 cm
ID Number
catalog number
accession number
Credit Line
from Thomas Neely, Jr.
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Work and Industry: Electricity
Data Source
National Museum of American History
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