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1096 HANDBOOK OF PROJECTION FOR
of the plates which has dried and this will in time serve to kill the battery.
WHEN WATER SHOULD BE ADDED.— The best procedure is to add water just before you start to charge the battery. This by reason of the fact that then the water will become thoroughly mixed and incorporated with the electrolyte.
WARNING. — Never add water to a battery just before or during the running of a show. If you do, you may expect that the theatre horns will know, and let you and the audience know, too.
LET THEM STAND A WHILE.— Never use a bat
tery immediately after charging. Let them stand for at least a full half hour. When a battery is under charge, the electrolyte bubbles and throws off gas. This continues in constantly lessening degree, but sufficiently to make itself manifest in the form of noise at the horns for a considerable while after charging has ceased. Only after the lapse of half an hour can you feel safe that it will have entirely ceased.
HYDROMETER READINGS. — The hydrometer reading you take is really a reading of the specific gravity of the electrolyte. Put in another way, it is a reading of the proportion or percentage of acid which has been removed from the electrolyte and incorporated in the plates themselves in the process of use. It is a reading of the relative strength or weakness of the electrolyte.
Hydrometer readings should always be carefully made. It is not merely a matter of dipping the syringe tip into the solution, sucking some of it up and glancing carelessly or hastily at the figures on the bulb.