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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).
Construction of an aluminium and felt roof, comparing the properties of aluminium to wood.

Identifier  ExFiles\Box 74\1\  scan0040
Date  29th November 1910
  
C.J.

X393

29th November 1910

29/11/10 R6/D291110 With reference to the question of an aluminium and soft felt roof, I should think it would have to be made with a wood frame panelled with aluminium, and such a device might be tried on the windscreen which you often use, in which there is a large surface of wood.

The only difficulty I can see with the aluminium is that it may be damaged by a weight being put on the roof. Aluminium having only low elastic limits is soon dinged and is quite different in this respect to wood. Therefore, the roof would not bear the corner of a box being jammed upon it.

I should suggest that the upper sheet be, say, .064" (16s S.W.G.) and the inner one .030" to .040". The felt need only be 1/8" between them, so that they

(upside down text at bottom right) A.R. 235A (100M) P 630. 29.10.10) E.P. 7793.
  
  


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