[Electric engineering.] . her hand, some arresters will workequally well either on direct or alternating current. 35. The Garton Arrester. — Fig. 43 illustrates theGarton arrester. The discharge points are of carbon, shownat h and/. These points are about-g-1^- inch apart, and the lower one isconnected to ground; f is a coil ofwire wound on the tube g, which isclosed at the top; e is a small core ofiron attached to the rod d, which inturn connects, by means of a smallflexible cable, to one end of the resist-ance b. The other end of the coilconnects to the other end of the resist-ance, to which
[Electric engineering.] . her hand, some arresters will workequally well either on direct or alternating current. 35. The Garton Arrester. — Fig. 43 illustrates theGarton arrester. The discharge points are of carbon, shownat h and/. These points are about-g-1^- inch apart, and the lower one isconnected to ground; f is a coil ofwire wound on the tube g, which isclosed at the top; e is a small core ofiron attached to the rod d, which inturn connects, by means of a smallflexible cable, to one end of the resist-ance b. The other end of the coilconnects to the other end of the resist-ance, to which the line also con-nects. The resistance b is made upof a stick of graphite and, havingpractically no inductance, it offerslittle or no opposition to the dis-charge. The discharge comes inover the line «, passes through b tothe rod d, thence to the carbon xG-rxnmdpoint h, and jumps the air gap to the fig. The discharge is followed by current from thedynamo and, since the coil is in shunt with the resistance,. 42 ELECTRIC LIGHTING. § 11 part of this current will flow through the coil, thus draw-ing up the core e and breaking the arc between e and fact that the arc also takes place in the enclosed tubetends to put it out. As soon as the discharge has passed,the core drops back and the arrester is ready for the nextdischarge. This arrester is very simple and is not liableto get out of order. The spark gap should be examinednow and then to see that it has not become enlarged or I Line^LA <±LA ^ LA I J -==- Ground Pig. 44. blocked up in any way. If the gap becomes too long, thelower carbon may be moved up a little. Sometimes arrest-ers are connected as shown in Fig. 44, as this arrange-ment gives especially good protection. Here three kickingcoils are connected in series and a lightning arrester isconnected in ahead of each coil. The Garton arrestermay be used on either direct-current or alternating-currentcircuits. 36. Westingliouse Arrester.—Fig. 45 show
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