. Electric railway journal . tted por-celain barrier, and this barrier offers a mechanical resistance tothe arc when it attempts to follow the rotating blade through theslot. It has a choking effect on the spark, due to the lack ofoxygen in the slot behind the rapidly rotating switch what remains of the arc is blown out by the draft or theinrush of air which follows the rotating blade. Switches of20-amp capacity are so constructed that when the circuit isbroken the switch blade rotates one-third of a circle or 120 deg. The company also makes a 35-amp, 65o-volt barrier-typeswitch for
. Electric railway journal . tted por-celain barrier, and this barrier offers a mechanical resistance tothe arc when it attempts to follow the rotating blade through theslot. It has a choking effect on the spark, due to the lack ofoxygen in the slot behind the rapidly rotating switch what remains of the arc is blown out by the draft or theinrush of air which follows the rotating blade. Switches of20-amp capacity are so constructed that when the circuit isbroken the switch blade rotates one-third of a circle or 120 deg. The company also makes a 35-amp, 65o-volt barrier-typeswitch for the control of electric heaters. This heater switchis a three-circuit switch and is connected as follows: The firstturn connects the heater of medium intensity, the second turncuts out the medium heattr and throws in the heater of greaterintensity, the third turn cuts in both heaters at the same time,and the fourth turn opens the heater circuit. Of course, othercombinations can be readily effected by this switch. The heater. Three-Degree Heater Two-Circuit Headlight Switch Switch switch handle may be turned in either direction so that it is notnecessary to pass from low to high degrees of heat in order toopen the circuit. The handles of these switches are of heavy, one-piece porce-lain to insure the user doubly against shock. The insulation isof solid sheet mica, and all current-carrying parts are fully in-sulated from the handle and from the switch mechanism. The latter is of a frictionless eccentric design and all wear-ing parts are of hardened steel. The contact jaws are of tem-pered spring phosphor bronze. The breaking movement of theseswitches is very rapid and they are designed to carry an over-load greatly in excess of their rated capacity. SPECIAL CONTROLLER HANDLE FOR AUXILIARYCONTACTOR CONTROL The new pay-within cars of the Capital Traction Company,of Washington, D. C, which were described in the ElectricRailway Journal of Sept. 18, 1909, page 434, are equippedwith f
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