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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).
Breakdown of the weights of tools in the kit for S.S. and Phantom models.

Identifier  ExFiles\Box 16\6\  Scan018
Date  1st May 1929 guessed
  
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PARTICULARS RELATING TO TOOL KIT ON S.S. AND PHANTOM.

Total weight of tool kit lbs. 57
(a) Weight of tools rarely used on road (excluding box spanners) 15½
(b) Weight of tools necessary on road 41½
% (a) of whole (left in garage) 26.7% }
% (b) of whole (carried) 73.3% }
(c) Weight of tools rarely used on road (including box spanners) 20
(d) Weight of tools necessary on road 37
% (c) of whole (left in garage) 35% }
% (d) of whole (carried) 65% }

Individual items.
The jack weighs 8 lbs. or 14% of total weight (57 lbs.)
The tyre pump weighs 6½ lbs. or 11.4% of total weight.
The starting handle and wheel spanner together weigh 10 lbs. or 17.5% of total weight.
The jack handle and mallet together weigh 4½ lbs. or 8% of total weight.
The jack, tyre pump, starting handle, wheel spanner, jack handle and mallet together weigh 29 lbs. or 51% of total weight.
This kit of 6 indispensable tools, weighing 29 lbs. is 78.4% of the weight of tools essential on the road.

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