From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter discussing the application and supply of strain elements for mechanical measurements and testing.
| Identifier | ExFiles\Box 168b\1\ img166 | |
| Date | 13th February 1939 | |
| Rolls-Royce Ltd. 2 13.2.39 in point of fact, the R.A.F. at Farnborough are very vitally involved in the application of these elements. Also, Messrs. Mullard, it appears, from this year's Physical Society Exhibition are making up a strain apparatus and all these devices fundamentally employ one of our strain elements which owe their efficacy to their being free from elastic hysteresis and enjoying practically a linear relation between strain and resistance change. The writer, for the sake of interest, puts forward the view that Moullin's torsion meter as used, for instance, in determining the torsional rigidity and other mechanical constants of the shafts of battleships and the like, is all ready for supersession in dynamometric tests by a suitable Erie strain element, but unfortunately it has not been possible in the course of his duties, for the writer to spare the time to make all these developments and determinations. Remembering the intricate and extensive mechanical measurements and investigations in which your Company must perforce engage, it just occurred to the writer that it might not be thought a presumption to bring just these simple facts before your notice regarding strain elements. We are able to supply these elements pretty well to any size and shape having the overall dimensions of our resistances, or even in the event of demands for special elements outside this range, we are able to make the tools for the moulding of such, and can further supply various resistances. We are at the full disposal of the R.A.F. in this matter but need hardly say this, and we are in the mood to serve you, also, in the most helpful manner we are able to. When convenient to yourselves, to let us have a word on the subject. /please | ||