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).
Specifications for a horizontal drive system using 8' x 4' pulleys and 30' or over shaft centres.
| Identifier | ExFiles\Box 55\2\ Scan057 | |
| Date | 17th April 1915 guessed | |
| Wor {Arthur Wormald - General Works Manager} /Hy {Tom Haldenby - Plant Engineer} 5/L.21515. 2. with 8" x 4" pulleys and 30" or over shaft centres would give entire satisfaction and transmit 2 1/2 HP reliably at about 3000 ft per min. The horizontal drive is much to be preferred to the vertical one. | ||