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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).
Specification sheet detailing electrical resistance, current, point gaps, and contact breaker timing.

Identifier  ExFiles\Box 48\2\  Scan159
Date  13th May 1924 guessed
  
-6- Contd.

(18) Primary resistance :- .34 ohms at 13°C
(Instrument NO 98 on 1.5 volt and ampere ranges)

(19) Secondary resistance :- 6375 ohms at 15°C
(Instrument NO 98 on 1.5 volt range
Instrument NO 22596 direct on Instrument)

(20) Secondary milli-amperes :-
Horizontal position :- 5.8
Vertical position :- 2.1

(21) Platinum point gap :- .012"

(22a) Platinum point gap :- .016"

Contact breaker timing :-

(auto + hand)

| Make. | Break. |
|---|---|
| A. {Mr Adams} | 19° | 97.5 |
| R. {Sir Henry Royce} | 77° | 155° |

| | Retarded. | Advanced. |
|---|---|---|
| Make. | 75° | 17° |
| Break. | 155° | 98° |
| Make. | 259° | 202° |
| Break. | 335° | 277° |

Make ratio :- .433

Contd.
  
  


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