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).
Table detailing the configuration of experimental 40/50 sandwich batteries.
| Identifier | ExFiles\Box 54\1\ Scan204 | |
| Date | 12th April 1926 | |
| X 46175 12.4.26. EXPERIMENTAL 40/50 SANDWICH BATTERIES. No. Label. Case. BATTERY - + 154. S1. P Exide P&R Exide P&R Exide P&R 155. S2. E. {Mr Elliott - Chief Engineer} P&R Exide P&R Exide P&R Exide 156. S3. P. P&R Exide P&R Exide P&R Exide 157. S4 E. {Mr Elliott - Chief Engineer} Exide P&R Exide P&R Exide P&R 159. SX E. {Mr Elliott - Chief Engineer} Std Δ P&R D Exide Exide P&R D Exide Std Δ Exide 170. SY. F. {Mr Friese} D Exide P&R Std Δ Exide Fuller P&R Oldham 171. SZ. O. {Mr Oldham} Fuller Oldham Fuller Std Δ Exide Oldham P&R 172. SJ. E. {Mr Elliott - Chief Engineer} Fuller Oldham Fuller Oldham Fuller Oldham 176. SU. P. Exide Oldham P&R Oldham Exide Oldham 177. SV. P. P&R Oldham Exide Oldham P&R Oldham | ||