Report of the British naval and military operations in Egypt, 1882 . tt, presided overby Lieutenant Colonel Richard Harrison, C. B., U. E., for the considera-tion of the subject of field-telegraph organization and equipment. Thisboard recommended a complete amalgamation, in time of war, of 0 troopand the two telegraph companies, 22d and 34th. In the mean time itsecured marked improvements in poles, wire, insulators, and instru-ments. The outfit at present is chiefly as follows: The ground cable is manufactured by Messrs. Siemens Brothers, of 269 London. It consists of a core composed of seven
Report of the British naval and military operations in Egypt, 1882 . tt, presided overby Lieutenant Colonel Richard Harrison, C. B., U. E., for the considera-tion of the subject of field-telegraph organization and equipment. Thisboard recommended a complete amalgamation, in time of war, of 0 troopand the two telegraph companies, 22d and 34th. In the mean time itsecured marked improvements in poles, wire, insulators, and instru-ments. The outfit at present is chiefly as follows: The ground cable is manufactured by Messrs. Siemens Brothers, of 269 London. It consists of a core composed of seven wires No. 22 B. W. GfcThe central wire is of steel, the others of copper, tinned. The dielectricis of rubber, the first layer being soft, the outer layers semi-vulcanizedand vulcanized. Over this is a wrapping of India-rubber tape, and thewhole is inclosed in tarred jute braiding. The total diameter is .24 resistance of the conductor is ohms at 75° Fahrenheit. TLieresistance of the dielectric is not uniform (the dielectric being so slight); Fig. 136. JFig. 137 Telegraph wagon. and is not guaranteed by the maker. The cable weighs 170 pounds perstatute mile, and has a breaking strain of 270 pounds. It is carried ondrums, each capable of holding five-sixths of a mile, which rest on a spe-cially designed wagon. (See Figs. 130 and 137.) Here they are secured bycap-squares and latches. An arrangement is fitted on either side of the 270 wagon for winding np the wire on the rear reel. It consists of a woodendrum fixed upon the back of the hind wheel of the wagon and concen-tric with it. From this an India-rubber band passes over a small band-wheel held in an iron bracket on the side of the wagon. The ends ofthis band are fitted with clips, and may be disconnected at will. Theaxis of the baud-wheel lies in the prolongation of the spindle of thewire-drum, and has upon its inner side a clutch. Corresponding tothis is another clutch on the spindle of the drum. These clutches
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherwashi, bookyear1883
