Rolls-Royce Archives
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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).
Graph plotting tire load against inflation pressure for various 4-ply tire sizes.

Identifier  ExFiles\Box 170\3\  img180
Date  9th December 1938 guessed
  
LOAD
1000
800
600
400
200
0
INF #/IN²
18
20
22
24
26
28
30
32
4 PLY
6.00
5.75
5.50
5.25
5.00
4.75
955#
860#
  
  


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