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).
Cutting from 'Electrical Review' detailing a battery condition indicator for motor vehicles.
| Identifier | ExFiles\Box 54\2\ Scan222 | |
| Date | 7th May 1928 guessed | |
| X 4457 Cutting from "Electrical Review" A BATTERY CONDITION INDICATOR. A device which is intended to show the charge condition of accumulators used for lighting and starting purposes on motor vehicles has lately been put on the market by Messrs. Tyer & Co.Ltd., Ashwin Street, Dalston, E.8. It is designed for fitting to the dashboard of a motor vehicle, and comprises a moving coil meter with a scale having three coloured divisions. The needle pointing to the division on the extreme left, red, indicates that the battery is discharged. The central section, yellow, corresponds to a medium state of charge, whilst the fully charged division, blue, is on the right and has an indicating mark in red which, when reached by the pointer, is an indication that the supply must be switched off. The yellow portion of the scale is calibrated in ampere-hours. The instrument is connected directly across the terminals of the battery. To ascertain the battery condition after ensuring that the dynamo is not charging, a load is put on the battery by momentarily switching on all the lights. Should the pointer not remain stationary, but gradually move to the low end of the scale, it is an indication that the battery is either not in good condition, or that the acid in the battery is not of the correct density. The instrument, the current consumption of which is only 6 milliamperes, is supplied in black or nickel-plated finish. A model with a moving iron meter and not calibrated in ampere-hours, is also available. | ||