Two graphs comparing engine coolant flow rates against RPM for different venturi and radiator outlet configurations.
| Identifier | ExFiles\Box 15\1\ Scan300 | |
| Date | 1st July 1930 guessed | |
| Graph 1: RAD E 73351 6/4/4 L.H. ENGINE USED A VENTURI IN TOP DELIVERY PIPE B. SUCTION SIDE C AND WRONG WAY ROUND SHEWING ERRORS IN MEASURING UNLESS VENTURI CORRECTLY FITTED Graph 2: RAD E 73448 6/7/41 MEAN BOTTOM WATER 67° A. {Mr Adams} TWO RAD OUTLETS & BOTTOM PIPE B. STANDARD SINGLE RAD OUTLET C DITTO FIRST L.H. ENGINE MINIMUM DELIVERY THAT WILL NOT CAUSE OVERHEATING. 23 - .125 HOLES IN OUTLET. Axes Labels: Flow (Gal) / Min ENGINE R.P.M. | ||
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).