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).
Construction and testing of different groups of condensers.
| Identifier | WestWitteringFiles\L\July1924-September1924\ Scan80 | |
| Date | 16th August 1924 | |
| RFC1/T16.8.24. -2- Contd. Group 2. (See curves sheets I & J) 1312, 1335. Condensers made up with untreated paper (purported to be identical with that used by the U.S.A. Bosch Co.), and the whole impregnated with commercial paraffin wax. Group 3. (See curves sheets I & J) 1578. Condenser made up with untreated white paper as above, and the whole impregnated with pure paraffin wax - melting point 140°F.{Mr Friese} 1577. Ditto - melting point 112°F.{Mr Friese} 1600. Ditto - melting point 125°F.{Mr Friese} Note. None of the above three condensers has been baked. The paraffin wax has been specially obtained from the British Drug Houses, of pure quality and melting point as described. Group 4. (See curves, sheet I) 1590. Condenser made up with varnished paper and impregnated ordinary commercial paraffin wax and not baked. 1609. Condenser made up with varnished paper and impregnated with a mixture of paraffin wax and resin, and baked. In the case of each condenser two cycles of temperature were performed, the first one going up to some temperature short of 70°C and the second one up to 75°C. On the curves, the capacity limits given in the production test of the condenser at temperatures of 18°C, namely, .275 to .325 mf, and at a temperature of 45°C, viz. .41 to .52 mf., are indicated in these tests by points enclosed in small circles. Not being, however, much concerned with the absolute value of the capacity of these condensers, they do not necessarily comply with these limits, even at 18°C. | ||