Blueprint chart recording the vertical wheel movement of a Packard's near-side front tyre under various road and test conditions.
| Identifier | ExFiles\Box 159\7\ scan0200 | |
| Date | 21th April 1938 guessed | |
| PACKARD RECORDS OF VERTICAL WHEEL MOVEMENT - NEAR-SIDE FRONT. TYRE PRESSURE 25LB/IN² TYRE SIZE 7·00" x 16" ON THE ROAD 25 M.P.H. 30 M.P.H. 35 M.P.H. MAIN ROAD REBOUND BUMP ASHBOURNE ROAD. 1/10TH SECONDS BYROAD AMBASTON LANE. HUMP BACK BRIDGE NEAR LONGFORD. ON THE BUMPER DRUMS. 50 R.P.M. 100 R.P.M. 200 R.P.M. 3/4" CAMS. 2" CAMS 100 R.P.M. 3" CAMS. 100 R.P.M. SCALE 1" = 9" | ||
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).