GB381350A - Improvements in devices for the adjustment of receiving sets for wireless waves - Google Patents

Abstract

381,350. Adjusting wireless apparatus. ROUTIN, J. L., 2, Rue du Capitaine Olchanski, Paris. Oct. 21, 1931. Convention date, Nov. 5, 1930. [Class 37.] A number of readily detachable station indicators, Fig. 5, are secured in groups corresponding to the wavelength ranges on cylindrical or disc supports provided with graduated scales co-operating with the indicators, the groups being protected by detachable screens which expose only the indicators in use. In one construction, Fig. 2, the station indicators are clipped into grooves on cylindrical members 9 the portions 9a of which project through the panel 1 and are protected by detachable screens 19. The screens are provided with windows 23 and the members 9 are illuminated by lamps 25 which are connected by pins 28 in the circuit of the wave-changing switch. The screens may have advertisements thereon and these are illuminated by the lamps. In another construction, Fig. 7, the station indicators are hooked into grooves 38, the other end of each indicator being sprung over the periphery of the support 39 which mav be constructed as a hollow truncated cone. The screen 40 is detachably secured to the panel by a spring member 54, 55 engaging its inturned edges 58, 59 after the manner of a bayonet-joint. In a further construction, Fig. 9, the indicator clips are located on drums 102, 103 which are associated with calibration curves 114 .. 117 detachably mounted on drums 110, 111. The curves and pointers 106, 107 provide a fine adjustment to the coarse chain gear 118 .. 122 by way of a lever 108 for operating an auxiliary condenser 109.