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MANAGERS AND FROJECTIOXISTS 1097
To secure a correct, reliable reading you must, of course, suck up enough electrolyte to cause the bulb to float clear of the bottom and release all pressure on the rubber bulb. Be careful, however, not to suck up enough to cause the tip of the bulb to touch at the top.
If there is not sufficient electrolyte to enable you to suck up enough electrolyte to float the bulb, then add water, but do not then take a reading until after you have either used or charged the battery. A reading taken just after adding water would be worse than useless, because it would be deceiving. However, the careful projectionist will watch the water level and never permit it to get that low.
OVER-DISCHARGING.— Be very careful never to over-discharge a battery. That is to say, never permit a battery to run too low before re-charging. As has already been set forth, lead sulphate is formed on both the positive and negative plates while a battery is discharging — while it is working and producing power.
Lead sulphate occupies more space, or has greater volume than has either the lead peroxide of the positive or the pure lead of the negative plates. The makers of the battery will have made allowance for this condition in the construction of the plates, but only on the assumption that the discharge will be kept within the limits set.
If that limit be much exceeded and the battery thus run too low, sulphate will be formed in excess of the provision made and, having no other place to go, it will literally be forced into the battery plates, which will work permanent injury to them and shorten their lives.
Never permit your batteries to fall below the minimum hydrometer reading specified for your particular