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).
Summary of the chief advantages of American central H.T. coils.
| Identifier | ExFiles\Box 61b\4\ scan0152 | |
| Date | 7th January 1928 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12 24) MP 306975 X4275 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E.7.C. Order No.: WC60 Customer's No.: American central H.T. coils. We give below a summary of what we consider to be the chief advantages of these coils. ① Easier and cheaper to manufacture as the case need not be an expensive moulding but could be made of sheet metal. ② Low resistance secondary winding with maximum insulation from the case. ③ The primary being wound on the outside has maximum heat radiation also the resistance is automatically increased and an additional ballast could be omitted even if the switch Signed: contd This Sheet must be filed on completion of the work. | ||