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 results for hydraulic tappets, measuring plunger resistance with various loads.
| Identifier | ExFiles\Box 17\6\ Scan341 | |
| Date | 20th March 1935 | |
| -3- Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}28/KW.20.3.35. 28-EX - Hydraulic Tappets. Resistance of plunger with various loads. Plunger and oil temperature 80°C. Time in secs. taken for oil to escape and movement of plunger. Weight applied Time taken in resistance of oil for .0625 drop. 50 lbs. .0625" 7 secs. .0625" 8 " .0625" 9 " .0625" 10 " 40 lbs. .0625" 9 secs. .0625" 10 " .0625" 10 " .0625" 11 " 30 lbs. .0625" 11 secs. .0625" 11 " .0625" 12 " .0625" 12 " 25 lbs. .0625" 14 secs. .0625" 18 " .0625" 18 " .0625" 19 " Hs{Lord Ernest Hives - Chair}/G.W.Hancock. | ||