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).
Graph plotting terminal volts at the motor with various batteries and starter cables on an RR car.
| Identifier | ExFiles\Box 168b\2\ img044 | |
| Date | 8th June 1921 guessed | |
| X.802 TERMINAL VOLTS AT MOTOR OBTAINED WITH VARIOUS BATTERIES AND STARTER CABLES ON R R CAR TEMPERATURES 60°F TO 80°F Graph Lines: - EXIDE AXNG-13.1 [MAKER'S TEXT] - WILLARD STRN 28 [OUR TEST] - 105A CABLE AND STD MOTOR TERMINAL TESTS - SAE No. 0 CABLE AND STD MOTOR TERMINAL TESTS [MAKER'S AND OUR TESTS] - STD. STANDARD MOTOR TERMINAL VOLTS - STD R.R. CABLE 84/24.L. (TINNED COPPER) MOTOR TERMINAL VOLTAGE EXPLANATION: BATTERY VOLTAGE DROPS ARE APPROX. FROM TESTS. THEY ARE VOLTAGES AFTER 5 SECS DISCHARGE AT VARIOUS RATES. RESISTANCE OF STD. MOTOR, TERMINALS &C OBSERVED = .020 VOLTS PER 10 AMPS. RESISTANCE VOLTAGE DROP IN BATTERIES. ARE WILLARD = .4 EXIDE = .8 DROP IN CABLES CALCULATED FROM COPPER (.75 OHMS PER CUBIC INCH) BIG TEST CABLE 450 WIRES .0126 DIA 168,000 PER SQ. IN. SAE No. 0 CABLE 155 WIRES .0126 DIA STD. R.R. CABLE 84 WIRES .0201 DIA 34,000 STD R.R. CABLE 24 FEET = .167V PER 100A = .22V Printer's Mark (right edge): A.{Mr Adams} WEST & PARTNERS LTD. PHOTO-PRINTERS 36, BROADWAY. WESTMINSTER S.W.1. | ||