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).
Table detailing chassis machining hours for experimental and works processes in 1940.
| Identifier | ExFiles\Box 176\2\ img072 | |
| Date | 4th May 1940 | |
| CHASSIS MACHINING HOURS. Date | Experimental Hours. | WORKS - | - | Gear Cutting. | Milling | Grinding | Drilling | Boring. 6th Jan. 1940 | NIL | NIL | NIL | NIL | NIL | NIL 13th " " | 188 Hours. | 4 Hours | - | 64 Hours. | - | - 20th " " | 389 " | 4 " | - | - | - | - 27th " " | 427 " | - | 3½ Hours | 10 Hours | - | - 3rd Feb. 1940 | 402 " | - | 12 " | 4 " | - | - 10th " " | 394 " | - | 14½ " | - | - | - 17th " " | 944 " | - | - | 6 Hours | 11½ Hours | 14 Hours 24th " " | 984 " | - | - | 13 " | - | - 2nd March 1940 | 737 " | - | 22 Hours | 5½ " | - | - 9th " " | 891 " | 21 Hours | 10 " | 26 " | 1 Hours | - 16th " " | - | 5 " | - | 32 " | - | - 23rd " " | - | - | - | - | - | - 30th " " | - | - | - | - | - | - 6th April 1940 | - | - | - | - | - | - 13th " " | - | - | - | - | - | - 20th " " | - | - | - | - | - | - 27th " " | - | - | - | - | - | - 4th May 1940. | - | - | - | - | - | - | ||