Rolls-Royce Archives
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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).
Comparison table for Tungsten used in high and low tension points from various suppliers.

Identifier  ExFiles\Box 35\5\  scan 089
Date  19th January 1920
  
TUNGSTEN FOR HIGH AND LOW TENSION POINTS

Ref. Letter. | Firm. | Contacts or rods. | Description. | Remarks.
A | L.P.S. | C | L.T. contacts for Watford Magnetos. | Fitted (First lot unsatisfactory EH1/AT 30417. (Second " lost. (Third lot
B | Gallen-Kamp. | R(.125" dia) | L.T. contacts for R.R. battery ignition. | Expl. Shop unable to work.
C | Delco. | C | Delco contacts obtained from Remy Elec. Co. | Fitted to screw and blade of R.R. Battery Ignition. Unsatisfactory owing to bad condenser connection. Running on 10,000 mile car (2 EX)
D | B.T.H. | R (.125" dia) | L.T. contacts for R.R. battery ignition. | Expl. Shop unable to work.
E | Ind. Lamp & Wire Co. | C | for Bosch magneto. |
F | " | C | Delco. |
G | " | C (.070" dia) | |
H | " | C (.125" dia.) | For L.T. contacts. | Fitted to blade and screw of battery ignition - Run 6 hours on bench. O.K. fitted to 49 GB.
I | " | R (.109" dia.) | |
  
  


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