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Show (tailed by G. Uougias ardrop. tditor of Kadio .Mtr.:handisins.; RADIO RtCEIV- CONCEALED SCRCEN ATRIAL GROUND WIRE IGNITION BATTERY I TO CHASSIS . I j Radio Receiving Set Installed in Automobile With Aerial Concealed in Top. One of the drawbacks to having an ! automobile equipped with radio has been the necessity for building on the ' car a disfiguring antenna or having w ithin it a proportionately cumber-i cumber-i some loop. A means of providing I radio entertainment whiTe en route, without tbe disadvantages mentioned, nas been worked out by a clever designer. de-signer. A copper screen is fixed between the roof and upholstery, thus completely concealing it from view. The metal parts of the machine, being all joined together, form the other plate of a large condenser having air and passengers pas-sengers as a dAectric, the separation being about five feet. Radio receiving sets equipped with loud talkers, so tbat all the passengers can hear the programs are being installed in-stalled in a number ol automobiles nowadays, particularly in public auto busses, one company in California carrying car-rying out extensive experiments with radio receivers on its line of busses. With the concealed metal screen antenna an-tenna used, and by installing the radio set in a flat cabinet, so that it can be placed in the side wall of the car, or possibly In a shallow compartment In the rear of the front seat, very little space is taken up by the apparatus. One stage of radio-frequency amplification, amplifi-cation, together with a detector and three stages of audio-frequency amplification am-plification at least should be used for j the average range of work to be ac- j complished with such a motorcar radio set. A separate storage battery is : preferable, but It Is possible to oper- j ate the set in most cases from the ; ignition storage battery belonging to the car. ( Science and Invention and Radio Xewi) j |