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).
The testing and features of the Athmos Primer.
| Identifier | ExFiles\Box 42\1\ Scan112 | |
| Date | 1st February 1925 | |
| R.R. 495A (50m) (D.B. 175 25-9-24) J.H.D. -2- EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/TAG/LC10.2.25. the petrol 4 ft., whereas, the RR. primer and reservoir are one unit. The Athmos was tested with a 40 ft. pipe line and at 30 strokes per min. it took 11 strokes to fill the pipe and a further 11 to pump 2 cu.ins. The Primer and fittings are very well made and every care has been taken to ensure petrol-tight joints, and non-return valves are fitted to prevent any leakage from the main supply through the primer when not in use. The only part not accessible is the filter. The filter is fitted in a small cylinder the ends of which are soldered. At one end of this cylinder is fitted a non-return valve, and care has to be taken when fitting up, not to get this the wrong way round. The fittings for the Athmos Primer consist of :- A 5-way piece for petrol distribution to the 4 jets, a small cylinder containing filter and non-return valve 3-way piece for fitting in carburetter feed pipe line. A special feature about the pump plunger is that the end of the piston rod is screwed and this screws into a recess completely closing both the suction and delivery ports. 2 ft. of string heated with graphite is used to pack the gland at the top of the pump cylinder. This gland has got to be very effective as there is no washer fitted on the piston. The non-return valves used are spring loaded ball valves. These are three in number, - one for cutting off the contd :- | ||