On Thursday, December 8, the museum will close at 3:30 p.m. due to a special event; Spark!Lab and Wonderplace will close at 3 p.m.

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.
See more items in
Work and Industry: Electricity
Data Source
National Museum of American History
Nominate this object for photography.   

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.

Note: Comment submission is temporarily unavailable while we make improvements to the site. We apologize for the interruption. If you have a question relating to the museum's collections, please first check our Collections FAQ. If you require a personal response, please use our Contact page.