. Electrical world. lutions, for measuring the specific heat of waterand steam, for observing the lowering of the freezing point of iceunder pressure, and for detennining the temperature of steam atdifTerent pressures, etc.âLond. Elec, March II. A very completeillustrated account of the first lecture of Callendar is given in , March 4. Telegraphy, Telephony and Telegraph.^SizyLESS.âA very long illustratedpaper read before the Berlin Electrical Society on the new high-speed April 1904. ELECTRICAL WORLD and ENGINEER. C63 type-printing telegraph of the Siemens & H
. Electrical world. lutions, for measuring the specific heat of waterand steam, for observing the lowering of the freezing point of iceunder pressure, and for detennining the temperature of steam atdifTerent pressures, etc.âLond. Elec, March II. A very completeillustrated account of the first lecture of Callendar is given in , March 4. Telegraphy, Telephony and Telegraph.^SizyLESS.âA very long illustratedpaper read before the Berlin Electrical Society on the new high-speed April 1904. ELECTRICAL WORLD and ENGINEER. C63 type-printing telegraph of the Siemens & Halske Company. Thetype printing is done by a photographic method, as shown in Fig. the rim of the type wheel the 45 different letters and types arccut out at uniform distances on the periphery. This type wheelrevolves between an electric spark-gap, F. and a sensible strip ofpaper, P. If a certain letter is between the spark-gap and thesensible paper, the arc will send its light through the letter, which. FIG. I.âTYPE PRINTING is cut out in the wheel, and the letter will be printed on the paperstrip. Since the time of the electric spark is smaller than one-millionth second, the paper strip can be moved at practically anyspeed without distorting the letter. The receiver and transmitterare operated as two apparatus always revolving in exact synchronismat a speed up to 2,000 , or even more. In every revolution oneletter may be printed so that 2,000 letters can be transmitted perminute. For every letter transmitted, the transmitter has to sendnut two current impulses, one positive and one negative, which actun a relay in the receiving station. By the negative impulses one ofnine group condensers of the receiving apparatus is charged, whileby the positive impulses the condenser is discharged at that placewhich corresponds to the desired letter. The apparatus is describedin detail and profusely illustrated.âElek. Zeit., March 10. Simultaneous Telegraphy and
Size: 1682px × 1486px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
