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).
Table of magneto performance test results, incorporating automatic advance.
| Identifier | ExFiles\Box 48\2\ Scan165 | |
| Date | 13th July 1923 | |
| X.430. TABLE OF MAGNETO PERFORMANCE TO NEW GENERAL SPECIFICATION. (INCORPORATING AUTOMATIC ADVANCE). Date of Test. | MAGNETO. Make. Type. No. | (1) Weight (lbs). | (2) Safety gap (mms) (+-12000 V) | + (3) Available range. Total (60º), Auto. (30º to 38º), Hand. (30 to 25º) | (4) Remarks. | (5) Speed range. (RPM.) | (6) | (7) Speeds (b)(210) (c)(190) | (8) | (9) Remarks 13.7.23 | Scintilla | AM6A | 26485. | 12.5 | 11.5 | 53 | 33 | 20 | H.T. brushes soft. Safety gap too large. | - | O.K. | 220 410 | - | Reasonab quiet. 21.3.24. | " | " | 34937. | 12.5 | 11.8 | 53 | 32 1/4 | 20 1/4 | " | - | O.K. | 150 280 | - | " 16.7.24. | " | " | 28531. | 12.5 | 11.1 | 51 | 32 | 19 | H.T. brushes soft. Safety gap too large. | - | O.K. | 140 230 | - | V. {VIENNA} quiet. 16.7.24. | " | " | 28533 | 12.5 | 11.2 | 53 | 33 | 20 | " | - | O.K. | 245 385 | - | " 21-8-24 | " | AG6A | 34903 | 14.5 | 11.2 | 57 | 38 | 19 | " | 960-1250 3.S agal 2 1/4m B at | OK | 160 290 | not complyin | Reasonably quiet 28-7-24 | Watford | E.G.6 | 18767 | 12 | + See separate curves for advance characteristics | | | | | | | | | 28-7-24 | Bosch | ZR6 | | 13.25 | 10.2 | | | | | | | | | + See separate curves for advance characteristics. Vertical text on right margin: X.4187. | ||