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 Joseph Lucas Research Laboratories discussing contact breaker 'make' and 'break' periods and primary inductance.
| Identifier | ExFiles\Box 35\6\ scan 295 | |
| Date | 11th July 1927 | |
| Y 2894 THE JOSEPH LUCAS RESEARCH LABORATORIES TELEGRAMS: "LUCAS, BIRMINGHAM" TELEPHONE: NORTHERN 2201 (P.B.X?) WELL STREET BIRMINGHAM WHEN REPLYING PLEASE REFER TO EOT/5. 11th July 1927. E.{Mr Elliott - Chief Engineer} Fowler Clark, Esq., Messrs. Rolls Royce Ltd., DERBY. Dear Mr. Fowler Clark, Please excuse the delay in replying to your letter of the 6th of this month. I did actually mean "make" and not "break". My object in making the make period as long as possible is that by so doing a larger value of primary inductance can be employed, and thus the maximum primary current can be maintained at a lower value than would be possible were a shorter make period to be adopted. I quite agree that there is also an advantage in the double contact breaker in having the greatly increased break period which is obtainable for cooling. I shall, before long, have more results on contact breaker tests of this kind, and will let you know how they turn out in due course. With kind regards, sincerely yours, O.{Mr Oldham} Turner | ||