. Operation of trains and station work; . to one binding post of the first in-strument, from the other binding post of the first instru-ment to one binding post of the second instrument, fromthe other binding post of the second instrument to thecopper pole of the first battery; if more than two batteriesare to be used the batteries should be connected runningfrom copper to zinc and zinc to copper, zinc should neverbe connected to zinc or copper to copper as they will-neutralize each other and no circuit be produced. TELEGRAPHY 5 If the key be separate from the base of the sounder itis better t
. Operation of trains and station work; . to one binding post of the first in-strument, from the other binding post of the first instru-ment to one binding post of the second instrument, fromthe other binding post of the second instrument to thecopper pole of the first battery; if more than two batteriesare to be used the batteries should be connected runningfrom copper to zinc and zinc to copper, zinc should neverbe connected to zinc or copper to copper as they will-neutralize each other and no circuit be produced. TELEGRAPHY 5 If the key be separate from the base of the sounder itis better to arrange the key a little to the right-hand side,in such a position that it can be reached while the armrests on the table in sending; place the sounder at theleft-hand side; to receive the wires small holes should bebored opposite the two binding posts of the sounder andfor the legs of the key. Connect a wire to one bindingpc^t of the sounder, the other end to one pole of the bat-tery, from the other pole of the battery connect a wire. with one leg of the key on the under side of the tablebetween the two washers in order that good connectionsmay be had; from the other leg of the key connect a wireto the other binding post of the sounder. To connect two separate keys and sounders togetherfor line practice begin by running a wire from one bind-ing post of the first sounder to the copper pole of the firstbattery, from the zinc pole of the first battery to one legof the first key, from the other leg of the first key to onebinding post of the second sounder, from the other bind- 6 TELEGRAPHY ing post of the second sounder to the copper pole of thesecond battery, from the zinc pole of the second batteryto one leg of the second key, from the other leg of thesecond key return the wire to the remaining binding postof the first sounder, this last wire is known as the re-turn wire and will work much better on a short circuitthan the ground wire. Ground wire may be used by connecting the
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Keywords: ., booka, bookcentury1900, bookdecade1900, booksubjectrailroadtrains
