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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).
Letter from George Roberts sending 'Prima' spark plugs for testing, noting a potential thread incompatibility.

Identifier  ExFiles\Box 33\3\  Scan183
Date  13th October 1921
  
GEORGE ROBERTS,
c/o PEEK, FREAN & CO., LTD.,
DRUMMOND ROAD,
LONDON, S.E.16.

TELEGRAMS: "PICKAXE, LONDON"
TELEPHONE: 3570 HOP (EIGHT LINES)

LONDON, S.E.16. 13th October, 1921.

X1812b

Messrs Rolls-Royce, Ltd.,
Nightingale Road,
DERBY.

Dear Sirs,

X1812
For the attention of the Manager of the Experimental Dept.

Referring to our recent correspondence, I am sending you this day, by Registered Parcel Post, 7 "Prima" Plugs, viz:-

6 to fit on to a Car.
1 for dismantling and examination.

These plugs have a gap of .50 m.m. I am having an additional 6 made with a gap of .75 m.m. for battery ignition, and I hope to receive these shortly.

Upon writing this letter it has, however, occurred to me that the thread of these plugs does not fit your Cars. Perhaps you will be able to fit them nevertheless.

I shall feel obliged if you will acknowledge receipt of this letter and let me know whether you will be able to test them, as you have kindly promised to do.

In the meantime,

I remain,
Yours truly,
George Roberts
  
  


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