. Journal of electricity, power, and gas . Fig-. 2. discharge of the charge in C will be opposed by B andthe charge will have to find another path which it doesthrough R. This discharge takes place in a minutefraction of a second, thus producing a sharp tap in thereceiver. Rapid Telegraph Transmitter. Fig. 3 shows the rapid telegraph transmitterwhich is operated by means of a punched tape has a series of small holes down thecenter. The holes on each side of this centralline are punched by hand and those on one siderepresent the dots, while those on the other representthe dashes of the
. Journal of electricity, power, and gas . Fig-. 2. discharge of the charge in C will be opposed by B andthe charge will have to find another path which it doesthrough R. This discharge takes place in a minutefraction of a second, thus producing a sharp tap in thereceiver. Rapid Telegraph Transmitter. Fig. 3 shows the rapid telegraph transmitterwhich is operated by means of a punched tape has a series of small holes down thecenter. The holes on each side of this centralline are punched by hand and those on one siderepresent the dots, while those on the other representthe dashes of the Continental code. The central line. Fig. 3. Rapid Telegrapli Transmitter. of holes engages the teeth of a sprocket wheel whichserves to feed the tape forward at a regular rate. The 296 JOURNAL OF ELECTRICITY, POWER AND GAS. [Vol. XXIV—No. 14 tape gear wheel has a number of very small and lightradial pins, which tend to fly out except when theyare held in position by the tape. Wherever a holeoccurs a pin is allowed to spring outwards. Thesepins are mechanically connected to larger pins on afurther attachment of the spindle which fly out whenthe smaller pins are actuated by the tape. Springcontacts are in series with a set of brushes which presson the segments of three rotating commutators, one ofwhich has a comparativel}^ large number of alternateconducting and insulating segments, and is reservedfor the dots, while the other two have longer spacingsof commutator segments, which are kept for thedashes. In this way all the actual making and break-ing of the current is carried on on these larger seg-ments, while the tape
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
