A MERLIN IS MADE: THE PRODUCTION OF MERLIN ENGINES AT A ROLLS ROYCE FACTORY, 1942 - Jane Wales checks the lengths and parallels of a Camshaft Bush on a Comparator, which registers an error of of an inch. The inspection section of this aircraft factory is attached to the machine shop and checks all diameters, lengths and other dimensions and uses various tools to do this. They also make hardness tests of pistons, gudgeon pins, pumps and boost controls. ,

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