. Operation of trains and station work and telegraphy . y is one most generally used forthe production of electric current for telegraph purposes;although during the last few years dynamos have beenintroduced into the production of electricity for thetelegraph and to a certain extent have lessened the useof the gravity battery in the larger offices. The gravity battery consists of a glass jar, a zinc, anda copper plate. The zinc is the positive plate and thecopper is the negative plate. It must be rememberedthat the positive current always moves away from thebattery and the negative returns to
. Operation of trains and station work and telegraphy . y is one most generally used forthe production of electric current for telegraph purposes;although during the last few years dynamos have beenintroduced into the production of electricity for thetelegraph and to a certain extent have lessened the useof the gravity battery in the larger offices. The gravity battery consists of a glass jar, a zinc, anda copper plate. The zinc is the positive plate and thecopper is the negative plate. It must be rememberedthat the positive current always moves away from thebattery and the negative returns toward it even if wehave the circuit grounded. The current starts from thezinc plate (which dissolves or is eaten away) thenthrough the solution to the copper plate and finds its «Hi TELEGRAPHY 23 outlet through the wire which leads from the copper andwe have the positive current to the line coming fromthe copper plate and the negative current returning tothe zinc pole of the battery; hence positive means cop-per to the line and negative zinc. Fig. 3. The arrangement of the batteryms as follows: theleaves of copper are spread and placed at the bottom ofthe jar and should be nearly covered with blue vitriol;the zinc suspended from the top of the jar and the jarfilled with soft water to within an inch from the top;it will require from three to four days for a battery ofthis nature to work up to full strength, the circuit ofcourse being closed. When a battery is in good work-ing order if the circuit can be left open when not inuse, it will strengthen and greatly save the battery. About every two to four months the zinc and thecopper should be taken out and thoroughly washed andcleaned and the clean liquid poured into a clean vessel,and the dirt which has accumulated by the decomposition 24 TELEGRAPHY of the zinc plate thrown out, and the jar the battery as before, adding more vitriol, andpouring in the clean liquid and enough water to makethe battery compl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1919
