Door Alarm Wedge
Stainless steel wind-up wedge door intruder alarm. The mechanism, similar to a bicycle bell, is attached to a wedge which attaches to the floor/carpet under a door. The alarm is set by a winding similar to an alarm clock. If the door is disturbed with force, the sensor pin strikes the bell and rings with an internal hammer
Picture No
11041958
Media ID
46875471
Size
6023px x 4020px
(4.2MB)
Credit
(c)Maurice Collins Images Collection /Mary Evans Picture Library
Source
Photograph of an original object in the Maurice Collins Collection
