IT has recently been said by a member of a firm of justly‐famous wire makers (1) that there is probably no finer grade of wire than that designed for aero‐engine valve springs to Air Ministry Specification D.T.D.5A, and despite the fact that this article will deal principally with defects in that wire, the author, from an experience gained from the handling of some hundreds of miles of it, must state at the outset that he can endorse this opinion.
Wood, E. (1938), "Valve‐Spring Wire: Methods of Inspection and Faults to which the Material is Subject", Aircraft Engineering and Aerospace Technology, Vol. 10 No. 4, pp. 99-102. https://doi.org/10.1108/eb030298Download as .RIS
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