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).
Inquiry to Messrs Hadfields Ltd. about the suitability of their varnish for impregnating enamelled copper wire windings.
| Identifier | ExFiles\Box 167\3\ img012 | |
| Date | 9th February 1937 | |
| 6110 Rm{William Robotham - Chief Engineer}/wst.7/AP. Experimental Department 9th February 1937. Messrs Hadfields Ltd., Western Road, Mitcham, SURREY Impregnation of Electrical Windings with Varnish. Dear Sirs, In connection with the coil windings, on various units of our Electrical equipment, we have under consideration the use of copper wire insulated with enamel and a specially prepared paper. We may, in some cases, wish to impregnate the windings with varnish, but at present are doubtful about doing so, as we have the impression that varnishes attack and tend to dissolve the enamel.. Will you please inform us concerning your varnish in this respect. Yours faithfully, FOR ROLLS-ROYCE LTD. | ||