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).
Providing specifications for a standard chassis coil in response to a query.
| Identifier | ExFiles\Box 34\1\ Scan006 | |
| Date | 1st September 1915 | |
| X.2512. X.562 - RE STANDARD CHASSIS COIL. X.2512. X.1607 E.{Mr Elliott - Chief Engineer} 1.9.15. Wor{Arthur Wormald - General Works Manager}/Mcr4/L195. In reply to your memo E2/IB25815, we are having sent to you under separate cover all the parts of the coil that you have requested in your memo. We give below Mr. Ellis's replies to your queries :- Question 1. Condenser. 200 leaves. Paper folds. 5" x 2-11/16" Lead coil. 5 1/2" x 2 3/4" x .005" Box.inside 5-5/16" x 2 7/8" x 7/8" deep. outside. 6" x 3 3/8" x 1 3/8" Questions 2.3.4 &5. Primary winding 223 turns .036" D.S.C. on an outside dia. of tubing of 3/4" Secondary winding :- 49 layers of .005 D.S.C. wire. 26 " " .0069 " " 1st. layer 450 turns decreasing to the last layers of 280 turns approximately. 1st. layer commencing 3/8" from each end and finishing 3/4" from each end. The decrease per layer is approximately 2 turns per layer. 27400 sec.turns . Ratio 122.7 There are full drawings with the exception of the core assembled, this is as follows :- 23s S.W.G. dia. 6 1/8" long 5/8" dia. Mcr. | ||