Scope and Contents File contains:Letter to Helen Megaw from R Winstanley Lunt 20 December 1942;'Memorandum on the Scientific Classification of Diamonds to ensure their efficient and economical use in mechanical applications - - -' produced by the Research Department of Callender's Cable & Construction Co Ltd', April 1942;J A Burns and R Winstanley Lunt, illustrated report on 'The Crystal Structure of Diamond', produced for Callender's Cable & Construction Co Ltd, December...