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A letter and a blueprint. The letter is typed in black and red ink on off-white paper. The blueprint contains handwritten details, white text on blue paper. The letter is on Metropolitan-Vickers Electrical Co. Limited headed paper. The letter contains five pages and is addressed to Major David, of the Powell Duffryn Steam Coal Co. Ltd. regarding a report of a visit to Powell Duffryn. The blueprint contains a table containing data on the starting tests on 1125 H.P. synchronous motor S.O. C241B78 driving F.H&B compressor at Mardy. Loose within beige/light brown card file containing information relating to the Powell Duffryn Ltd.
