Putting a Battery out of Commission

If for any reason a battery is to lie idle for a prolonged period and recharging is not possible, it must be dealt with as follows:

First, it is charged until the plates hava their normal colour; and then charged again after rests of an hour, until gassing begins as soon as charging begins.

Second, the cells are disconnected.

Third, positive plates are drained and negative plates immersed in clean water.

Fourth, the negatives Are drained after Boaking 24 hours. If they heat in drying, they should be soaked again.

Fifth, the cells are emptied, washed out, Bnd dried.

Sixth, the plates are put back into the empty cells, which are covered over to exclude dust.

If all this is done carefully, the plates will be good for future service. On the other hand a battery that is merely left to Btand will ruin itself by sulphation.

Electric Light Switch, Automatic. Where a cupboard or storeroom is provided with an electric light controlled by a switch outside the door, it is easy to forget to switch off after the door has been shut and, with no light visible to warn one that the lamp is still burning, a considerable amount of current may be wasted. The obvious preventive is to make the act of closing the door work the switch automatically.

A simple method is to run a cord from the switch through an eye screwed into the door-frame almost level with the top of the door, and to fix the other end to a second eye placed level with the first and about a foot from the hinge edge. The length of the string should be so adjusted that sufficient tension is put on the string to operate the switch before the door actually shuts.

Since string is sure to stretch sooner or later and need readjustment, part of the string may advantageously be replaced by a long spiral spring, which will be extended sufficiently by the closing of the door to move the switch. The screw-eye through which the cord works should be of good size, to prevent wear at the angle.

The arrangement described assumes the switch to be on the hinge side of the door. Should, however, it be on the closing side, tlireo guides will be needed to take the cord across the top of the door and down to the correct level. In such a case it would be advisable to use pulleys near the top corners of the frame.

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