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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).
Design position report for the Spectre Chassis, listing various modifications and their status.

Identifier  ExFiles\Box 30\4\  Scan268
Date  5th September 1934 guessed
  
(3)
ITEM
SPECTRECodename for Phantom III CHASSIS.
DESIGN POSITION.

Alternative connecting rods. Completed.
Rear axle buffer - improved type. In hand.
Variable periodicity device in spring cylinder - I.F.W.S. In hand.
Modifications to switch box - switching for warning light & petrol pumps. Completed.
Filter for autoadjusting tappets. In hand.
Alternative short duration camshaft and valve springs to suit. In hand.
Modification to reduce weight of crankshaft. In hand.
Front dumb iron and bumper bracket. In hand.
Modifications to central web of crankcase to facilitate removal of sand. In hand.
Lightening holes in distance pieces - front crossmember ends. Completed.
Modification to bonnet rest plate and bracket. Completed.
Lightened central distance piece - front cross-member. Completed.
Larger water pump. In hand.
Experimental modification to horn button. Completed.
Distribution board without cutout. In hand.
Modified starter switch in switchbox. Completed.
  
  


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