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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 distributor dimensions, make ratios, and ranges, expressed in fractional values of the distributor pitch.

Identifier  ExFiles\Box 4\5\  05-page206
Date  24th June 1921
  
X 430

X.430. TABLE OF MAGNETO DISTRIBUTOR DIMENSIONS, MAKE RATIOS, AND RANGES X 800
EXPRESSED IN FRACTIONAL VALUES OF THE DISTRIBUTOR PITCH IN EACH CASE.

| Magneto. | Type. | Width of carbon brush. | Width of segment. | Sum of brush & seg: | Make ratio. | Sum of make ratio, brush & segment. | Range. | Forward overlap at advance. | Forward overlap at retard. | Backward overlap at advance. | Backward overlap at retard. | Remarks. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Watford. | E.6 | .15 | .62 | .77 | .86 | 1.63 | .17 | .14 | .31 | .49 | .32 | Standard. |
| " | EO.6(a) | .15 | .61 | .76 | .91 | 1.67 | .18 | .15 | .33 | .52 | .34 | |
| " | (b) | .16 | .62 | .78 | .89 | 1.67 | .35 | .08 | .43 | .59 | .24 | Extra long range (630). |
| R.Bosch. | ZR.6 | .12 | .65 | .77 | .46 | 1.23 | .20 | .15 | .35 | .08 | -.12 | Long cams. |
| U.S.A. Bosch | ZR.6 | .22 | .61 | .83 | .85 | 1.68 | .21 | .13 | .34 | .55 | .34 | |
| " " | B.6 | .25 | .18 | .43 | ..86 | 1.29 | .20 | .03 | .23 | .26 | .06 | Jump spark distributor. |
| " " | DUZ.6 | .20 | .61 | .81 | .87 | 1.68 | .19 | .13 | .32 | .55 | .36 | |
| Conner. | CM.1 | .10 | .62 | .72 | .43 | 1.15 | .27 | .10 | .37 | .05 | -.22 | Long cams. |
| B.T.H. | PM.6 | .26 | .25 | .51 | .56 | 1.07 | .25 | .01 | .26 | .06 | -.19 | Jump spark distributor. Medium cams |
| Eisemann. | GN.6 | .18 | .55 | .73 | ..84 | 1.57 | .17 | .22 | .39 | .35 | .18 | 6 Stationary carbon brushes, and one revolving metal segment. |
| Dixie | Aero 648. | .18 | .54 | .72 | .41 | 1.13 | .21 | .12 | .33 | .01 | -.20 | Polar Inductor machine. Long cams |
  
  


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