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).
Performance graph of a Wraith Oil Pump with a Bakelite casing, showing delivery and suction depression before and after a 652-hour test.
| Identifier | ExFiles\Box 149\2\ scan0201 | |
| Date | 24th March 1939 | |
| WRAITH OIL PUMP - BAKELITE CASING DELIVERIES AT 75°C WITH .625" DIA SUCTION PIPE. DELIVERY - PTS/HR 3500 3000 2500 2000 1500 1000 500 0 DELIVERY BEFORE TEST DELIVERY AFTER 652 HOURS DEPRESSION AFTER 652 HOURS DEPRESSION BEFORE TEST PUMP R.P.M. 500 1000 1500 2000 SUCTION DEPRESSION - LBS/SQ" 7 6 5 4 3 2 1 FIG I. 24.3.39.. | ||