Word: locksmithing
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Dates: during 1925-1925
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...Multiplex System. Upon a 10-metre "carrier" wave, Mr. Hammond's multiplex sending instrument impresses modulations, much as a locksmith files teeth in a blank key. A set of eight modulations goes out with each compound signal of the set of eight messages. Physically, these modulations consist in alterations of the length of the carrier wave by fractions of a centimetre (down to 9.984 m., up to 10.016 m.). In the instrument that receives the multiplex or "scrambled" messages, one circuit is made sensitive to the carrier wave, other circuits to specific modulations thereon; much as the slot...