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Page 38
... intruder . Some of them are clearly visible additions , and thus are useful as deterrents . The sight of a formidable- looking lock can persuade a criminal to move on and try his luck elsewhere . Ideally , every window easily accessible ...
... intruder . Some of them are clearly visible additions , and thus are useful as deterrents . The sight of a formidable- looking lock can persuade a criminal to move on and try his luck elsewhere . Ideally , every window easily accessible ...
Page 70
... intruders , but an intruder who stays long enough to see where the noise is coming from can silence the alarm by simply flicking the ON / OFF switch . The more costly model at the top of the op- posite page , which is set with a remov ...
... intruders , but an intruder who stays long enough to see where the noise is coming from can silence the alarm by simply flicking the ON / OFF switch . The more costly model at the top of the op- posite page , which is set with a remov ...
Page 72
... intruder with sudden light as well as sound . A speaker switch turns the alarm horn on and off ; with the switch in the OFF position , the indicator light can be used to test the unit without sounding the horn . Delay switches for the ...
... intruder with sudden light as well as sound . A speaker switch turns the alarm horn on and off ; with the switch in the OFF position , the indicator light can be used to test the unit without sounding the horn . Delay switches for the ...
Contents
Silent Sentries Loud Alarms | 69 |
Two Basic Circuits | 76 |
The Eyes and Ears that Detect Trouble | 84 |
Copyright | |
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acetylene alarm systems anchor angle Antonio Gaudí attach basement black wires block bolt bottom brace bracket burglar burglar alarms button cable chain link chisel circuit wires clamp closed connect connector control box dead-bolt door drill drive bar edge electric eye extinguisher fabric fasten feet fence fixture flame floor floor-mat foil frame gate grille handrail heat helper hinge hose inches inset inside install intruder jamb joists knob lamp latch light lock magnet mark mercury-vapor Mercury-vapor lamps metal mortise mortise lock mounting nail needle valve open circuit opposite oxygen pane picket pilot holes plastic post-and-rail fence protection puddle pull ramp safe sash secure sensor shim side slide smoke detector solder space spreader stairs stairway steel stretcher bar strike plate strips studs switch tape terminal post thumb turn tighten top rail torch wall wallboard welding window wood screws