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 detailing a test on tungsten contact points with double capacity to suppress sparking.
| Identifier | ExFiles\Box 34\1\ Scan280 | |
| Date | 7th November 1921 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 X2512 8 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFE Date: 7. Nov. 1921 Order No: AB.29. Customer's No.: 1 X.2894 Tests of Tungsten Points with Double X.2512: Capacity and on 6 volts In order to see if sparking could be completely suppressed and so enable tungsten contact points to operate satisfactorily, two condensers were connected in parallel * by short stout copper wires and used in conjunction with a set of Fansteel Contacts (AB) and run for 160 hours. The points have, however, developed in a slightly less degree, the same faults as with the standard capacity, viz, pitting and discolouring, though very little sparking occurred whilst running. Towards the end of the run, bad Signed * .392 m.f total. (Cont'd) This Sheet must be filed on completion of the work. | ||