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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Instruction book matter regarding charging a vehicle's battery in a garage from an external source.

Identifier  ExFiles\Box 26\2\  Scan289
Date  16th May 1928
  
INSTRUCTION BOOK MATTER.

CHARGING IN GARAGE FROM EXTERNAL SOURCE.

A unidirectional current is necessary. If the supply be alternating, suitable rectifying apparatus must be used. There are two or three reliable types of rectifier on the market which are capable of supplying to a six-cell battery a charging current of from 2 to 6 amperes. Instructions for the operation of these will normally be supplied by the makers.

If the current from the public or supply main, or other source, be direct, the charging current must necessarily be supplied through a suitable switch and a variable resistance, or set of lamps, preferably carbon filament, suitably arranged to act as a variable resistance. Before connecting up the battery for charging purposes, it should be confirmed that the resistance is in the main shewing the higher potential to earth. For this purpose take a lamp of supply main voltage, earth one terminal to water or gas pipes, and connect the other terminal to each charging terminal in turn. With the minimum possible resistance in the circuit, the lamp should light more brightly on that terminal supplied through the resistance. Otherwise, the mains feeding the board require interchanging.

The number of lamps in circuit, or the variable resistance, must be suitably adjusted to allow of the flow of the required charging current, which should not exceed 8 amperes, and should be reduced as the charge proceeds to about 4 amperes at the finish, when all plates should be
  
  


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