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).
Examination report on a U.S.A. Exide Battery Type 3XCR-13-IRA for left-hand drive chassis.
| Identifier | ExFiles\Box 164\4\ img016 | |
| Date | 20th February 1931 | |
| To R. {Sir Henry Royce} from EFC. {E. Fowler Clarke - Electrical Engineer} c. Sg. {Arthur F. Sidgreaves - MD} c. Wor. {Arthur Wormald - General Works Manager} E. {Mr Elliott - Chief Engineer} c. Ey. Da. {Bernard Day - Chassis Design} X6021. EFC {E. Fowler Clarke - Electrical Engineer} 2/AD20. 2. 31. X.6021. U.S.A. EXIDE BATTERY TYPE 3XCR-13-IRA FOR LEFT-HAND CHASSIS. (TWO SIMILAR 6-VOLT UNITS CONSTITUTE THE BATTERY). We have had in our laboratory one of the above 6-volt units for inspection etc. One cell of this battery has been opened up for examination and the following is a copy of my assistant's report JD. {J. Draper - Frames} 119 on this examination :- "This battery is a 3-compartment moulded container type made of hard rubber, more commonly known as ebonite. Solid lead burnt up connections are used and the terminals are of the taper post type. Using the clip terminal will be found difficult because this will not pass through the hole provided in the chassis box. The layout of the cells is not a mirror inversion of our standard R.H. batteries, this means the cable must pass over the battery top to the terminal. The sealing compound is very soft and will run into the cells at temperatures likely to be experienced. Internal construction of cell. 13 plates of a thin type are used combined with thin wood and ebonite separators. This is to enable the maximum capacity to be obtained in the minimum of space. Positive Plates. No. of plates 6. Active surface per plate 5.4" x 4.5" Thickness .092" Negative plates. No. of plates 7. Active surface per plate 5.4" x 4.5" These plates are much thinner than our standard and being more in number i.e. 13 instead of 11. | ||