— The microphone is now used by burglars for picking combination locks. On turning the lock a slight sound is made when the proper number comes opposite tho working point, and this can even be heard by a sensitive car. However, it is imperceptible to most persons, but by using a microphone it, is an easy matter to hear the sounds. A suitable form of flat telephone receiver is employed, and it is applied against tho safe next the lock. A pair of rubber ear-tubes are used with the telephone. Tn this way the sounds are heard which allow of opening the lock. Mr A. M'Rae, a water diviner, has been operating in North Otago for a period r f about two months (says the Oamar:i Mail, dojring which time ho has been successful in locating water for upwards of hO farmers. *
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Bibliographic details
Otago Daily Times, Issue 16003, 20 February 1914, Page 9
Word Count
141Page 9 Advertisements Column 2 Otago Daily Times, Issue 16003, 20 February 1914, Page 9
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