Nikola Tesla Books
KICKING COIL APPARATUS 75 rod. The little cylinder is to be drilled and tapped to a dept of ½ in. to take the 8/32 rod. The stationary contact is so designed that the tension of one contact against the other may be regulated to a nicety. This is effected through the medium of a fine thread on the adjusting screw which is of ¾ in. diameter brass rod. The silver contact cylinder is driven into a hole drilled in the end of the adjusting screw. The reverse end of this screw is tipped with a fibre knob of good size. The Choke Coils.-The smaller of these coils, Fig. 4, serves as a magnetic device to actuate the interrupter. It consists of a core of soft iron wires formed into a bundle ¾ in. in diameter and 4 in. long, covered with several layers of empire cloth; over this is a winding of 1000 turns of No. 22 D.S.C. or enameled wire wound 72 turns per layer and 14 layers deep. A turn of empire cloth is interspersed between each two layers of wire. The core is supported between heads of fibre that fit closely over the bundle of iron wires. A good construction is to form a spool of fibre tubing with square fibre heads, forcing the core wires into the tube after the winding is completed. As the drawing shows, the layers of wire do 2층- Wind with 1176 turns of No.20 enameled or D.C.C. wound two in parallel. 84 double turns per layer 14 layere deep Large ohoke coil Fig. 5.-Large choke coil in detail 152100
