Punching’. Photo (7) from a series illustrating the making of a window. From page 16 of catalogue. The caption says ‘Holes not requiring tapping are punched.’ John Thurgoood, who worked there, says this picture was taken at the Witham works. See link for notes on the catalogue.

Ref	M1940
Publisher	Crittall Manufacturing Company Ltd.
Date taken	1951-1953
Source	Crittall Windows catalogue no.163, 1953. Published by Crittall Manufacturing Company Ltd., Braintree. Large book. Copy lent by John Thurgood of Terling. There is another copy at Braintree museum.