. The principles underlying radio communication . tRadio Telephone and Telegraph Co. and is desgnated as TypeVT-21. Tube No. 13 is made by the Moorehead Laboratoriesand is extensively used. Tube No. 14 is made by the Connect-icut Telephone and Electric Co. and has a plate outside of theglass tube in which the filament and grid are contained, theelectron flow to the plate occurring through the glass. TubeNo. 15 is a very small tube made by the Western Electric is designated as Type VT-5, or Type N. Tubes Nos. 16, 17, 18, 19 are French tubes. Tubes Nos. 16,17, 18 are intended primarily fo
. The principles underlying radio communication . tRadio Telephone and Telegraph Co. and is desgnated as TypeVT-21. Tube No. 13 is made by the Moorehead Laboratoriesand is extensively used. Tube No. 14 is made by the Connect-icut Telephone and Electric Co. and has a plate outside of theglass tube in which the filament and grid are contained, theelectron flow to the plate occurring through the glass. TubeNo. 15 is a very small tube made by the Western Electric is designated as Type VT-5, or Type N. Tubes Nos. 16, 17, 18, 19 are French tubes. Tubes Nos. 16,17, 18 are intended primarily for receiving, but are also usedto some extent for transmitting. Tube No. 16, which has twoprojections at the top, is designed primarily for apparatus in- 4 4fL |: J, J hit 1 2 3 4 1 ,1 i ■ 1 i J i 5 8 9 10 11 12 13 14 15 ff 16 17 18 19 20 Fig. 265.—Practical forms of three-electrode electron PRACTICAL FORMS. 471 tended to operate on short wave lengths, the idea of the con-struction being to keep the connections to the grid and plate. Fig. 266.—Large transmitting tubes. as widely separated as possible to minimize the capacity be-tween them. In all these French tubes the filament is straight,the grid is a spiral wire surrounding the filament, and the plate 472 ELECTROS TUBES. Is a cylinder surrounding both. Tubes Nos. 17 and 18 are re-ceiving and amplifying tubes for general service and are madeby different manufacturers. Tube No. li) is designed primarilyfor transmitting and lias an output of about 40 watts. TubeNo. 20 is a Telefunken German receiving tube, which issimilar to the French receiving tubes. In Fig. 266 tubes NOS. 21, 22, 23 are Larger transmittingtubes. No. Jl is an American tube made by the De forestRadio Telephone and Telegraph Co., and is called by that com-pany an oscillion; it has a power output of about LOO No. 22 is an American tube made by the General Elec-tric Co. and called by them a Type P Pliotron; it has arated output of 250 wa
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1922
