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).
Specification sheet detailing distributor dimensions in relative and absolute units, with a handwritten explanatory note.
| Identifier | ExFiles\Box 40\2\ Scan196 | |
| Date | 1st June 1927 guessed | |
| -2a- Distributor dimensions. | | Relative. | Absolute (inches) | |---|---|---| | Pitch (P) = | 1.000 | 1.310 | | Make ratio (M) = | .575 | .753 | | Range (R) = | .333 | .436 | | Forward overlap at full advance (Fa) = | .004 | .005 | | Forward overlap at full retard (Fr) = | .337 | .441 | | Backward overlap at full advance (Ba) = | .182 | .238 | | Backward overlap at full retard (Br) = | -.151 | -.198 | | Width of brush (B) = | .427 | .560 | | Length of segment (S) = | .183 .61 | .240 | | Distributor dia. (D) = | 1.910 | 2.500 | Handwritten note: As this distributor is a jump spark type with the rotating brush of larger dimensions than the stationary segment, the overlap is considered to be the amount the segment overlaps the brush. | ||