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Silent emergency alarm system for schools and the like

Author
Read, W. S.
Published
Jul 31, 1973.
Physical Description
1 electronic document
Additional Creators
Roberts, V. W.
Online Version

Availability

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Restrictions on Access
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
An emergency alert system is described. In a school each classroom (or other area) is instrumented with a hidden microphone and receiver tuned to a non-audible frequency. The receivers' outputs are connected to a central display unit in the school's administrative office. Each instructor is provided with a small concealable transmitter which, when hand activated by the instructor upon the occurrance of any emergency, generates a non-audible signal at the receiver's tuned frequency.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19730021473.
Accession ID: 73N30205.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15973152