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).
Calculations regarding the area of coils and clearance for a 220/450 transformer.
| Identifier | ExFiles\Box 32\4\ Scan006 | |
| Date | 17th September 1919 | |
| X 1581 17th Sep.t. 1919. X.1581 - 220/450 TRANSFORMER. With the gauges on the attached page, the area of coils = 2.62 x 9 (sq. ins) = 23.6 Area available = 3.49 x 11.4(sq. ins.) = 39.8 This allows a clearance area of .87 x 2.4 sq.ins. for insulation, packing up, etc. (In the original 100/2000 winding the primary had 270 turns (19 or 20 gauge) D.C.C. wire. Coil(primary) area was .58 x 9 sq. ins). = 5.22 (RES)) | ||