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).
Test report comparing the performance of various batteries under different loads.
| Identifier | WestWitteringFiles\C\May1919\ Scan39 | |
| Date | 26th April 1917 | |
| Contd. -4- EFC1/T2.5.19. Battery. | Current switched on. | Steady terminal voltage when current attained a steady value. | Instantaneous voltage reading when current was broken. | Difference of voltes. | Battery resistance. ------------------------------------------------------------------------------------------------------------------------------------------------------------------ Lucas 60 amp. hr. celluloid. | 101 amps. | 11.34 | 12.21 | .87 | .0086 C.A.V. 60 amp. hr. celluloid. | 101 | 11.23 | 12.33 | 1.10 | .0109 P.& R.{Sir Henry Royce} 60 amp. hr. celluloid. | 96 | 10.73 | 12.04 | 1.31 | .01365 Chloride 60 amp. hr. ebonite. | 97 | 10.92 | 12.21 | 1.29 | .0133 P.& R.{Sir Henry Royce} 45 amp. hr. ebonite. | 96 | 10.87 | 12.16 | 1.29 | .0134 Fuller. | 88.6 | 9.87 | 11.50 | 1.63 | .0184 Tudor 60 amp. hr. ebonite. | 84 | 9.46 | 12.09 | 2.63 | .031 Tudor 60 amp. hr. celluloid. | 82 | 9.23 | 12.16 | 2.93 | .036 Tudor 45 ampere hr. ebonite. | 75 | 8.44= | 11.97 | 3.53 | .047 Set of 6 M.A.2 Exides. | 83.5 | 9.36 | 11.99 | 2.63 | .0315 The actual resistances of the various batteries, when carrying heavy currents such as are drawn by the starter motor, we think are fairly well determined in the above way. We have found, however, that the resistance does not appear to be the same for different strengths of current, being considerably higher for smaller currents than for larger ones. The illustrate this Contd. R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm 2/156/13. | ||