. Electrical news and engineering . ansmitting circuits of the quads are a modification of theJones system as used by the Postal Telegraph Co., a single pole-changer being placed on the polar side, and two of them on theneutral side, as shown in fig. 2. Opening PC thrc>ws line to P,and closing PC throws line to N. P gives positive currents only,and N gives negative. N and P are worked simultaneouslyclosing N and P gives the total current to the line, and openingthem gives only the partial current of either jioKirily according tothe position of PC. Each lead from the quads to batteries has .
. Electrical news and engineering . ansmitting circuits of the quads are a modification of theJones system as used by the Postal Telegraph Co., a single pole-changer being placed on the polar side, and two of them on theneutral side, as shown in fig. 2. Opening PC thrc>ws line to P,and closing PC throws line to N. P gives positive currents only,and N gives negative. N and P are worked simultaneouslyclosing N and P gives the total current to the line, and openingthem gives only the partial current of either jioKirily according tothe position of PC. Each lead from the quads to batteries has .1resistance of 700 ohms, made up by two 16 110 volt incande-scent lamps. The leads from the batteries to the single wirespass through one 16 110 volt lamp for each wire. It is intended to i>lace storage for the locals in the H. C officelater, and the system for working locals in the main office hasbeen designed with that end in view—the onh in the mainoffice then being to move No. 2 local over to H. U. During. into quads, ihe same course is followed, except that switch S isnot required on the repeater sets. To leg H. U. office on, theswitch S remains on the left hand contact, the pegs lor the send-ing and receiving sides are moved over to the two H. U. wiresselected. The circuits now are as follows : Kor sending—Earth,batteries No. 2 and 3, switch S, key, transmitter, discs, strip B,H. U. sounder, key, earth ; receiving—earth, batteries, relay,sounder, discs, strip C, H. U. sounder, earth. In each case thecircuits have been increased to 40 ohms plus the line resistance toH. L., but at the same lime the battery jjower has been incieasedso that the current is about of Ihe same strength as before. Inpractice we found that the line resistance was so small that itcould be neglected, and thai the two additional cells were quitesufficient. The Milliken-Hicks repeaters are connected up in a differentmaimer from that in use at any other place. The governor cir
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