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).
Invoice details from Hepworth & Grandage Ltd. for various Phormicast rings for experimental purposes.
| Identifier | ExFiles\Box 148\1\ scan0087 | |
| Date | 29th March 1939 | |
| Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Files 1236. G/WFH/CA.15/PS. 29.3.39 We have an invoice from Hepworth & Grandage Ltd., dated 21st instant, details of which are shown below. If these Rings may be paid for, will you kindly give Roy{Sir Henry Royce} instructions for covering order to be issued. FOR EXPERIMENTAL PURPOSES. 16 PHORMICAST PARALLEL FACE COMP RINGS FOR TOP GROOVES. 3½ x 3/32 x 3.81 3.56 BUTT JTS. 5d each - 6 8 12 PHORMICAST CORNERED COMP RINGS. 3½ x 3/32 x 3.81 3.56 BUTT JTS 7d each 7 0 11 PHORMICAST S.D.O. RINGS 3½ x 4 m.m. x 3.81 3.56 BUTT JTS 7d each 6 5 Postage 1 0 1 6 £1 0 7 G/WFH | ||