. Electrical equipments for movable bridges. GASOLINE ENGINE AM) GENERATOR. One of the units used by the Northern Pacific Duluth. The engines are started by the storage batteryusing the generator as a motor. A motor-driven air pump is shown in the lower righthand corner. Compressed air is used for brakes, whistle,andfor raising gasoline and water. -41- -42- RELEASE SWITCHES IN GLASS CASE. In case of irregularities in operation it is some-times necessary to operate without regard to the should be done only in extreme emergency in which casethe operator must
. Electrical equipments for movable bridges. GASOLINE ENGINE AM) GENERATOR. One of the units used by the Northern Pacific Duluth. The engines are started by the storage batteryusing the generator as a motor. A motor-driven air pump is shown in the lower righthand corner. Compressed air is used for brakes, whistle,andfor raising gasoline and water. -41- -42- RELEASE SWITCHES IN GLASS CASE. In case of irregularities in operation it is some-times necessary to operate without regard to the should be done only in extreme emergency in which casethe operator must break the glass to reach the switches. This view shows the name plates used to mark all PENNSYLVANIA BRIDGE OVER CHICAGO RIVER AT EIGHTEENTH ST. CHICAGO AI30 used by the Chicago & Alton span is raised by two 325 horse power motors; the largestin use on a drawbridge. Power is supplied by Commonwealth Edison Co. tocharge a storage battery which in turn supplies the current ranges from 750 to 3000 amperes at 250 volts. -43- -44- TROLLEY j?OR VERTICAL LIFT form of trolley transfers current from thestationary towers to the lifting span. An example of special design required in bridge work.
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