ADT 400-1 Relay Sprinkler Supervisory Transmitter

ADT 400-1 Relay Sprinkler Supervisory Transmitter

Usage conditions apply
Description (Brief)
ADT 400-1 Relay Sprinkler Supervisory Telephone Transmitter. Vertical wall mount wood box housing electrical controls; hinged cover and hinged frame on back. ADT (American District Telegraph) marking on label.
Currently not on view
Object Name
Box, Control
alarm transmitter
Physical Description
wood (overall material)
metal (overall material)
overall: 14 3/4 in x 9 1/4 in x 6 3/4 in; 37.465 cm x 23.495 cm x 17.145 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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