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VARIOUS APPARATUS 83
tend to lose their charge, it may be necessary to charge them for a longer time than they are used. It is therefore necessary to check the condition of the batteries every day. Measure the specific gravity of the acid in the batteries by the use of the hydrometer. For this purpose, select one cell in each of the four battery groups — A-i, H-i, A-2, and H-2 — for use as a pilot cell and read the gravity in each of these four cells by removing the filling cap and drawing enough acid into the hydrometer barrel to lift the float. After reading, replace all the acid withdrawn and put the cap back. Never measure the gravity just after adding water. Wait until the battery set just used (if the reading in either pilot cell is below 1250) continues charging until both pilot cells are up to this figure, indicating full charge. On the A and H battery set just used, a reading below 1200 in either pilot cell indicates that the set has been used too long without charging. Give it a full charge to bring the gravity up to 1250 as soon as possible, and alternate the sets more often. Batteries will not permit satisfactory operation, or their life will be shortened, if the gravity is allowed to go below 1200. The B batteries should be recharged as soon as any pilot cell gets below 1230. Continue the charge until all pilot cells are up to 1285.
The F batteries should be treated in the same manner as the A and H batteries.
The B batteries do not need to be charged every day, but will require charging two or three times a week, as indicated by hydrometer readings.
It will be relevant, at this point, to say something concerning Battery Charging Panel (i-FD). This panel is mounted in a metal cabinet on the wall and is used for charging the storage batteries. In the upper part of the panel are two six-pole double-throw knife switches. The switch on the left controls the A-i and H-i batteries, and the one on the right the A-2 and H-2 batteries. Each