Graph plotting the results of riding tests with Mack engineers, comparing different vehicle cushion and damping setups on a varied course.
| Identifier | ExFiles\Box 43\2\ Scan082 | |
| Date | 14th December 1925 | |
| For evaluating seats, operator held instrument in lap. RIDING TEST RESULTS WITH MACK ENGINEERS. SEP 21 & 22 1925. SHEET 1. RESULTS AT 30M.P.H ON VARIED COURSE Newton Accelerometer LEGEND: No 1 Cushion} Best R.R. result 102 E X with No 2 Good } 6 x 6 tires, Houdaille lovejoys, cloth cushion. } with Poor cushions No 3 Cushion} Worst R.R. result, new sedan with No 4 Hook } 33 x 5 tires, R.R. sh'k abs, lovejoys, cloth cushion. } with Better cushions Poor front damping in No 5 Cushion} Mack H.L. bus lovejoys No 6 Floor} leather cushions [5 PASSENGERS IN R.R.] [AL BUS HAD 5 PASS'RS {Sir Henry Royce's Secretary} & BALLAST] VERTICAL AXIS (ROAD TYPE): 7 Repetition hot plus a little asphalt 9 Very Rough dirt Full of holes 6 Combination Rough dirt asphalt etc 4 Choppy Asphalt + 3 Very Choppy Asphalt 2 Brick 1/2 mi Asphalt 1/2 mi al Fair Cement 1/2 mi 0 Fair Concrete HORIZONTAL AXIS: NEWTOMETER UNITS ["NEWTS"] PER MILE. 225 200 175 150 125 100 75 50 25 0 OTHER TEXT: (Faint stamp) FEB 14 1926 (On right edge) Cy DEC 14 /25 | ||
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).