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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).
Test results page detailing secondary milliamps, primary point gap, and contact breaker timing.

Identifier  ExFiles\Box 65\3\  scan0167
Date  18th January 1928 guessed
  
-5- Contd.

(14) Secondary milliamps :-
Maximum :- 21.2
Minimum :- 5.3

(15) Primary point gap after previous tests :- .010"

Primary point gap .006"

Contact breaker timing.

| Make. | Break. |
|---|---|
| A | -15° | 99° |
| R | 45° | 160° |

| | Retard. | Advance. |
|---|---|---|
| Make. | 40° | -20° |
| Break. | 159° | 98° |
| Make. | 229° | 169° |
| Break. | 342° | 281° |

Make ratio:- .64

Primary point gap :- .014"

Contact breaker timing.

| Make. | Break. |
|---|---|
| A | -8° | 95.5° |
| R | 52° | 156° |

| | Retard. | Advance. |
|---|---|---|
| Make. | 51° | -9° |
| Break. | 155° | 95° |
| Make. | 233° | 173° |
| Break. | 337° | 276° |

Make ratio:- .58

Average variation in Break :- ±2°
  
  


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