DETAILLE, JEAN BAPTISTE

(1348not|/1913), Fr. artist; excelled in military | and historical pictures—(e.g.) The Dream (Luxembourg), The Pa ing Regiment, The Conquerors, etc.; equestrian portrait of King Edward VII. WIR op balled Abies ELESS, a device ine hich te ) TOCeLVINg ‘Hots sy convert iho t S otiae cuba a a owing in © antenna or related circuits to a | UHi-directional, pulsating current or to | 22 alternating current of a frequency of | the human ear. Some minerals such as Silicon, Carborundum, Zincite and Sornee bs to hoae extent as a rectifier (or aie gens ae ae poe et ey. per | 46 dueetion nel hore eaaey oui i | +5 opposite one. Such minerals, if | properly placed in the circuit of a radio Seized|receiver, act as detectors, and are of|commonly called crystals. Detectors working on electrolytic and magnetic | principles have been used succe fully. The most sensitive and dependable detectors are those of the vacuum tube type. The action of these is based on the emi ion of electrons from highly heated metals in vacua. These electrons have the tendency of conveying current, from conductors placed in their path, in one direction and not in the other, hence their rectifying and ‘detecting’ action. This type of detector, called Fleming Valves, audions, three element valves and triodes po e es the desirable property of remaining in adjustment for a long time, which cannot be said of some crystals. See Rapio TrLEpHony.