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VARIOUS APPARATUS 85
Horn Circuit — One 15-ampere cartridge fuse in the negative
side. Monitor Horn Circuit — One 3-ampere cartridge fuse in the
positive side. Film Circuit — One 10-ampere cartridge fuse in the positive
side.
Each fuse is located beside the terminal of the circuit with which it is associated.
The charger employed on A. C. supply uses three No. 189049 Tungar Bulbs, or two when there is no F battery. It has two 15-ampere plug fuses for the A-H charging circuit, and one 15-ampere plug fuse for the F charging circuit.
In addition we have Battery Charging Panel (2-FD). This panel is mounted in a metal cabinet on the wall and is used for charging the storage batteries. In the upper right-hand part of the panel are two six-pole double-throw knife switches, one above the other. The top switch controls the A-i and H-i batteries, and the lower switch the A-2 and H-2 batteries. Each switch connects its set of batteries either for charging or for operating, according to the way it is thrown, as marked on the panel. At the bottom of the panel are two three-pole double-throw switches. The left-hand switch controls the F-i batteries, the right-hand switch the F-2. Each switch connects its set of batteries for charging or for operating, according to the way it is thrown, as marked on the panel. If the installation does not have film pick-up equipment, these switches are, of course, not used.
The fifteen B batteries are divided into five groups of three each. These units are charged in parallel and discharged in series. In the upper left-hand corner of the panel are a seven-pole and a five-pole double-throw switch. The seven-pole switch at the top controls three of the B battery groups, and the five-pole switch below it controls