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).
Two illustrations of a 'Q' Meter, a device for measuring air flow capacity.
| Identifier | ExFiles\Box 38\1\ Scan021 | |
| Date | 4th January 1918 | |
| R.R. 86 (20H.) (SE. 636. 4/1/18.) Bm. 2/229/24. V 3404 Glaisher Capacity 250 ft. free air per min. Area a x H Vela 550 High Speed 700 THE Q METER GRIFFIN & TATLOCK LTD LONDON Capacity 750 cu. ft. free air per min. | ||