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).
Product brochure for the SEI Photometer and accessories for densitometry.
| Identifier | ExFiles\Box 168a\3\ img513 | |
| Date | 24th September 1940 guessed | |
| Manufactured by SALFORD ELECTRICAL INSTRUMENTS LTD Distributed by ILFORD LIMITED . ILFORD . LONDON SEI Photometer accessories for densitometry | ||