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).
Set of crucial instructions and maintenance advice for accumulator users.
| Identifier | ExFiles\Box 44\5\ Scan020 | |
| Date | 2nd December 1927 | |
| X4049 2.12.27. TO ACCUMULATOR USERS. X664 (who should read and assimilate every sentence most carefully). Do not interpret the instructions contained on the maker's label as you would interpret an advertisement. THEY REALLY ARE IMPORTANT. IT REALLY IS IMPORTANT to maintain the level of the electrolyte by the addition of distilled water (or acid if electrolyte is spilt), so that the PLATES are ALWAYS COVERED. IT REALLY IS IMPORTANT that every accumulator with plates of ordinary thickness, not more frequently requiring charge as a result of ordinary use, be given a freshening charge at intervals not exceeding ONE MONTH, or SIX WEEKS as the ABSOLUTE MAXIMUM. (With block plates the intervals may be longer). IT REALLY IS IMPORTANT NEVER to allow the potential difference (P.D.) between the terminals of any cell on normal discharge to FALL BELOW 1.8 VOLTS. IT REALLY IS IMPORTANT NEVER to allow the specific gravity of any cell on discharge or otherwise to fall below 1150. IF YOU DO NOT WANT TO USE YOUR ACCUMULATOR for a period and you do not want the expense and trouble of maintaining it in active condition, then you must adopt the ALTERNATIVE OF:- | ||