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 detailing two generators for a Magneto Speed Indicator and their specific resistance values.
| Identifier | ExFiles\Box 34\2\ Scan049 | |
| Date | 5th October 1922 | |
| RR.238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 X. 2238 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To EFR. Order No AR.155 Customer's No. 1 5 Oct 1922. x 2238 Magneto Speed Indicator Two generators for the above use, are in the experimental dept, each fitted with resistance bobbins. The first machine is fitted, apparently in error, with an iron bearing plate across the polepieces. Its resistance is divided into two concentrically wound parts, connected in series. The outer coil is single layer and adjustable by a sliding contact. The values of these resistances are - inner, 200.0 w, outer 64.2 w, max total 264.2 w. The second machine has a single bobbin non-adjustable resistance of 537 w resistance. (contd) Signed This Sheet must be filed on completion of the work. | ||