Three comparative graphs showing oil pressure versus engine revolutions for a Phantom new type relief valve.
| Identifier | ExFiles\Box 66a\4\ scan0029 | |
| Date | 1st July 1927 guessed | |
| PHANTOM NEW TYPE RELIEF VALVE. Graph 1: Y-Axis Label: LBS □" X-Axis Label: ENG. REVS. Line Labels: MAIN, ROCKER, GEARS BOW SPRING E.74522, E.21860 - .005" 3.5 OZS. TO CLOSE VALVE .050" CLEARANCE. MAIN SPRING E.75748. LOW PRESS. E.75757. OIL TEMP. 60°C WATER TEMP. 80°C Graph 2: Y-Axis Label: LBS □" X-Axis Label: ENG. REVS. Line Labels: MAIN, ROCKER, GEARS BOW SPRING. PRODUCTION. MAIN SPRING E.75748 LOW PRESS SPRINGS. 8 OZS. OIL TEMP. 64°C WATER TEMP. 82°C Graph 3: Y-Axis Label: LBS □" X-Axis Label: ENG. REVS. Line Labels: MAIN, ROCKER, GEARS BOW SPRING. PRODUCTION. MAIN SPRING E.75748. LOW PRESS SPRINGS E.76290 OIL TEMP. 63°C WATER TEMP 82°C | ||
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).