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).
Log of trials for a speed indicator tester.
| Identifier | ExFiles\Box 33\5\ Scan080 | |
| Date | 25th February 1925 | |
| TRIALS OF SPEED INDICATOR TESTER. 4 Date. Approx. time Period. Time under 10 mins. for 3000 counter revs. (secs.) % Fast. Frequency 19.3.26. 11.35 to 11.45 -.8 -.13 49.93 " 3.15 to 3.25 -.2 -.03 49.98 " 4.10 to 4.20 + 4.0 + .67 50.34 22.3.26. 10.50 to 11.0 + 3.4 + .57 50.29 " 11.10 to 11.20 + 1.2 + .20 50.10 " 3.45 to 3.55 + 1.4 + .23 50.12 " 4.30 to 4.40 + 3.3 + .55 50.28 23.3.26. 9.0 to 9.10 - .6 - .10 49.95 24.3.26. 11.5 to 11.15 + .2 + .33 50.16 " 12.0 to 12.10 + 1.0 + .17 50.90 29.3.26. 11.10 to 11.20 -3.3 - .55 49.73 " 11.25 to 11.35 +4.6 .77 50.38 " 11.40 to 11.50 +1.4 .23 50.11 " 12.30 to 12.40 + .50 .083 50.04 30.3.26. 9.45 to 9.55 +1.9 .32 50.16 " 10.5 to 10.15 +2.9 .48 50.24 " 4.45 to 4.55 +1.0 .17 50.80 31.3.26. 9.5 to 9.15 -.50 -.083 49.96 " 2.40 to 2.50 +.80 .13 50.60 " 4.10 to 4.20 Correct. .0 .0 25.2.25. | ||