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).
Two specifications for a Venturi Flow Meter and outlining a potential claim for the company's own design.
| Identifier | ExFiles\Box 37\2\ scan 131 | |
| Date | 26th February 1918 | |
| X 3180 To Srh. from EFC. EFC3/AT26.2.18. X.3149 - VENTURI FLOW METER. X.3180. We return herewith the two Specifications on the subject of venturi flow. This, in our opinion, does not cover the ground of our venturi meter. The smaller one of these claims the combination of a bye-pass with the venturi tube, in which bye-pass is placed a meter of any convenient type which operates by flow, said flow being a certain small proportion of the total flow. The second specification deals with the means of automatically controlling the rate of passage of a fluid by means of the statical difference of the pressure produced between the two points of the venturi tube. We imagine that what might be claimed for our meter would run as follows.- "In meters for the measurement of water flow, and more particularly for the measurement of the flow of the circulating water of an internal combustion engine, the combination with a venturi tube of a differential pressure meter connected differentially to the two points of the meter tube, between which a difference of pressure is produced by the flow there through; the indications of the pressure meter which are thus of a statical nature,, representing according to a certain law flow taking place through the main tube. In the case of the Petrol Flow Meter. In petrol flow meters a combination with a venturi tube of a manometer (Contd). | ||