Letter from McPherson's Limited to Messrs Bendigo Electronic Co. of Australia, dated 15 November,1950. Letter is from John Byrt, Asst. Chemist for Attention Mr. Stevenson. Cover letter states they have enclosed copies of Report No. 17355 covering 'Dezincification of Brass Wire in 'Scalebuoy' Water'. Two pieces of wire were analized. In the discussion the brittleness had resulted from dezincification,which was known to be a common type of corrosion of that material. It was recommended that different wire be used. Four alloys were recommended: Cupro-nickel, Aluminium brass, Arsenical brass and Admiralty brass. Two copies of the report.sciences, instruments - general, scalebuoy, bill ashman collection, mcpherson's limited, messrs bendigo electronic co of australia, mr stevenson, j byrt

Light tan envelope addressed to Messrs Bendigo Electronics Co. of Australia, 31 View Street, Bendigo. Attention Mr. Stevenson. McPherson's Ltd. Box 4500 Melbourne, Victoria printed in the bottom left corner. Envelope contained 2 negatives, 3 photos (2 the same) and a piece of paper with a typed 'Modern Physical Laboritory Practice by John Spring, Ph. D.'scalebuoy, bill ashman collection - correspondence, mr stevenson, bendigo electronic co of australia, mcpherson's ltd