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Amgueddfa Cymru – Museum Wales
Printed in black ink on white paper. Includes eight black and white photographs and eight diagrams and graphs. A paper 'Turbine Blade Vibration: Method of Measurement and Equipment Developed by Brush' by F. Andrews and J.P. Duncan. Reprinted from 'Engineering August 17, 1956.' Loose within a beige/light brown file containing copies of the 'Metcalf papers' and documents relating to the 'Conversion of Turbo Compressor to Electrical Drive'.
