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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).
The production of aluminium castings for a 40 mm gun for the Admiralty.

Identifier  ExFiles\Box 176\3\  img091
Date  31th December 1940
  
HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm.{William Robotham - Chief Engineer}

Rm.{William Robotham - Chief Engineer}3/AL.31.12.40.

ALUMINIUM CASTINGS FOR 40 mm. GUN.

2

We spoke to Hs.{Lord Ernest Hives - Chair} about the
question of Vickers producing the remainder of the production
order for the 40 mm. gun for the Admiralty.

He agreed that Vickers could do
the lot.

I suggest that Vickers forthwith
put 50 sets of castings in hand in No: 1. Grade material and
in the meantime we test the bits in the 2nd. Grade material.

If the 2nd. Grade alloy stands
up satisfactorily, the remainder of the production order can be
made in this material.

Rm.{William Robotham - Chief Engineer}
  
  


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