TRACKING OSCILLATORS

Radio Record, Volume I, Issue 4, 12 August 1927, Page 4

TRACKING OSCILLATORS

A BRITISH SLIECTH,

a The latest addition to the twentieth century wonders is a van, like an undersized Black Maria, with a cirenlar frame acrial on the roof It is used as a Post Office sleuth in tracking down wireless oscillators. A hand on an innocent-looking dial inside the van is able to point with unerring certainty to the actual house in which the mysterious annoying oscillator resides, after which the officers enter, and geitle persuasion and expert guidance follows. It is truly an ingenious system.: Bearings are taken on three sides of an area visited and plotted down on a large scale map. If the lines intersect each other, the location of the oscillator is known, and the van proceeds immediately in the indicated direction, As the house is approached the oscillations become | gradually fainter, till zero point is_ reached, when the van gets immediate-_ ly before the house.