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 for a Wraith pump with a bakelite casing, comparing delivery and depression before and after a 500-hour endurance test.
| Identifier | ExFiles\Box 149\2\ scan0193 | |
| Date | 24th March 1939 | |
| WRAITH PUMP WITH BAKELITE CASING DELIVERIES AT 75°C AND WITH A .625" DIA SUCTION PIPE DELIVERY BEFORE TEST DELIVERY AFTER 500 HOUR ENDURANCE TEST DEPRESSION AFTER 500 Hour ENDURANCE TEST DEPRESSION BEFORE TEST DELIVERY IN PTS/HR SUCTION DEPRESSION IN "H2O PUMP R.P.M. 24-3-39 BL 2316 | ||