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 data showing water vertical coefficients of discharge for various nozzles under different head pressures.
| Identifier | ExFiles\Box 36\1\ scan 052 | |
| Date | 15th May 1916 guessed | |
| X.2907 WATER VERTICAL. COEFFICIENTS OF DISCHARGE Nozzle | Head 1. | Head 2. | Head 3. -------------------------------------- A1 | .779 | .824 | .827 A2 | .739 | .781 | .773 A3 | .678 | .696 | .690 A4 | .583 | .555 | .554 -------------------------------------- B1 | .826 | .858 | .891 B2 | .817 | .837 | .876 B3 | .796 | .808 | .854 B4 | .779 | .785 | .827 -------------------------------------- C1 | .786 | .826 | .843 C2 | .786 | .826 | .843 C3 | .786 | .826 | .843 C4 | .786 | .826 | .843 -------------------------------------- D1 | D2 | .855 | .838 | .937 D3 | D4 | | ||