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).
Instructions for testing electrical leakage in condenser cases at high temperatures.
| Identifier | ExFiles\Box 39\3\ Scan210 | |
| Date | 6th November 1918 | |
| RR. 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. 19 To Order No. Customer's No. J.{Mr Johnson W.M.} high temperatures. In order to show how much of the losses were due to leakage the cases were lined and covered with large tin-foils of about 100 □ cms each and connected through a Weston milli-ammeter to a 200 volt dc supply. When cold, no leakage could be detected, but when hot, both cases showed a leakage resistance of about .5 Ω. A similar test was made on a stabilite case which showed no leakage either hot or cold. It was found however that with any condenser across a spark-gap, the introduction of another gap in the condenser circuit (losses) (Cont d) Signed This Sheet must be filed on completion of the work. | ||