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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).
Trickle charging, efficiency, and comparative costs of metallic rectifying units versus Tungar type units.

Identifier  ExFiles\Box 32\5\  Scan027
Date  16th December 1929
  
EFC2/AD16.12.29 contd.

-2-

voltage are available if only trickle charging is desired. The overall efficiency of a unit such as RP.10.G. would probably exceed 60%, this being the ratio of useful battery charging current to current supplied as measured by the consumer's meter.

Prices are not quoted in the catalogue mentioned though it seems probable that the cost of these units would be somewhat greater than the cost of a complete rectifying unit of the Tungar type of the same output, as against this however, it seems probable that the first cost of the metallic rectifying unit is likely to be the last cost, whereas the Tungar type of valve requires periodic renewal.

EFC.
  
  


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