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).
Specification for condenser paper to suit an arrangement where it is folded flat and placed vertically on the side of an ignition tower.
| Identifier | ExFiles\Box 52\3\ Scan034 | |
| Date | 2nd December 1921 | |
| X.4430 2.12.21. X.4430. PAPER FOR CONDENSER TO SUIT ARRGT. IN WHICH CONDENSER IS FOLDED FLAT AND PLACED VERTICALLY ON SIDE OF IGNITION TOWER. Required preferably in reels of, say, 25 yards each as a minimum (50 yard reels accepted). Width 2.500" capable of being rolled and interleaved with .0005 to .0010" x 2.300" of strip tin or aluminium foil, without tearing where it overlaps the edges of the foil. Maximum thickness should be .0015" to .002". Di-electric inductivity should be not less than 5.5 and breakdown voltage not less than 400 (R.M.S.A.C.). It must either be perfectly free from weak spots or obtained .001" thick with a breakdown potential exceeding 300 volts, when it can be used double for reliability. EFC {E. Fowler Clarke - Electrical Engineer} | ||