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 of coefficients of discharge for head 3, detailing various bore lengths and diameters.
| Identifier | ExFiles\Box 36\1\ scan 061 | |
| Date | 9th February 1917 guessed | |
| -6- (b) TABLE OF COEFFICIENTS OF DISCHARGE FOR HEAD 3. Length of Bore:- 1/2" 3/4" 1 1/4" 2" 2 3/4" 3 1/2" 4 1/2" Diam:of bore. 3/64" { Rad.in. .81 .76 .64 .56 X X X } A { Rad.out. .79 .72 .61 .55 X X X 3/32" { Rad. in X .84 .82 .77 .73 X X } B { Rad. out. X .82 .81 .79 .69 X X 1/8" { Rad. in. X X .87 .81 .79 .74 X } C { Rad. out. X X .80 .76 .74 .74 X 3/16" { Rad. in. X X X .88 .83 .81 .81 } D { Rad. out. X X X .83 .81 .80 .78 | ||