Operation
A Tungar is operated by means of a snap-switch in the upper left-hand corner and a regulating switch in the center. Before starting the apparatus, the regulating switch should be in the “low” position.
The Tungar is now ready to operate. Turn the snap-switch to the right to the “On” position, and the bulb will light. Then turn the regulating switch slowly to the right, and, as soon as the batteries commence to charge, the needle on the ammeter will indicate the charging current. This current may be adjusted to whatever value is desired within the limits of the Tungar. The normal charging rate is six amperes, but a current of as high as seven amperes may be obtained without greatly reducing the life of the bulb. Higher charging rates reduce its life to a considerable extent. Lower rates than normal (six amperes) will increase the life of the bulb.
Turn the snap-switch to the “Off” position when the charging of one battery or of all the batteries is completed; or when it is desired to add more batteries to the line.
The Tungar should be operated only by the snap-switch and not by any other external switch in either line or battery circuits.
When the snap-switch is turned, the batteries will be disconnected from the supply line, and then they may be handled without danger of shock.
Immediately after turning the snap-switch, move the regulating handle back to the “Low” position. This prevents any damage to the bulb from the dial switch being in an improper position for the number of batteries next charged.