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).
Instructions from Mr. Royce regarding design specifications for an indicator, needle valve, and filter, including a sketch with clearances.
| Identifier | WestWitteringFiles\E\August1920\ Scan59 | |
| Date | 8th August 1920 | |
| To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} -3- E4/G28/8/20 Contd. Mr. Royce would like you to allow 2" laterally between the centres of the indicator and the stand pipe, each device being 1" out of centre with the tank itself, that is to say, the indicator will be 1" to the right, and the stand pipe will be 1" to the left, or vice versa. Referring to the needle valve, a lead in should be provided for the needle by chamfering the hole in the bottom guide. The filter at the bottom end is prevented from collapsing by a corrugated tube in light sheet metal sweated within the gauze. This tube is not long enough to interfere with the feed holes top and bottom. The operating handle of the needle should be made about two-thirds of its present thickness all over, as it is thought to be unnecessarily heavy. The petrol feed holes in the top needle guide can be much larger in diameter, as it does not matter if they exist under the seating for the spiral spring. Mr. Royce agrees to the substitution of a fibre washer on the needle seating for the sweating which was previously required for locking. Referring now to the indicator, the clearances for the magnets, and the thickness of the casing between the magnets can be, Mr. Royce thinks, as in sketch - THICKNESS OF CASING ABOUT .035 CLEARANCE ABOUT .015 CLEARANCE ABOUT .025 (Contd.) | ||