mTE'ai MP n'gRC HA MO ISE M A Invisible Ray z.—.. Defective : "A 4=— Zs This photo-electric detective generates an invisible ray which sets off an alarm in an adjacent room, or a neighbor’s house, when an intruder passes through it. Any deliberate movement of the units or their disconnection from wall outlets will likewise cause the alarm to sound. A glass infra red filter placed in the unit at the right in the sketch blots out all visible rays Ums giving an intruder no warning.
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https://paperspast.natlib.govt.nz/newspapers/WAITA19390718.2.114.2
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Wairarapa Times-Age, 18 July 1939, Page 8
Word count
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86Page 8 Advertisements Column 2 Wairarapa Times-Age, 18 July 1939, Page 8
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