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).
The apparatus and connections for production testing of condensers for battery ignition.
| Identifier | ExFiles\Box 34\1\ Scan181 | |
| Date | 6th August 1919 | |
| A.{Mr Adams} M.{Mr Moon / Mr Moore} (100 T) (S.F 846 6-8-19 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2486) EFC/T2.3.20. X.1627 - APPARATUS & CONNECTIONS FOR PRODUCTION TESTING OF CONDENSERS FOR BATTERY IGNITION. X. 2512. In order to limit oscillatory disturbances in the circuits due to the inter-action of the condenser effect and the reactences which are unavoidably present, when a transformer is used for raising the voltage to a test value, apparatus, described below and connected up as in diagram herewith, is suggested for the satisfactory production testing of condensers. Referring to the diagram, terminals T represent an A.C. supply of 210 volts. F and S are a two ampere fuse and single pole switch respectively, mounted together on a board (but it is advisable that these be connected in the lead which shows the greater potential to earth). R represents a variable reactance, which, for simplicity, may be a laminated electro-magnet with windings of suitable magnitude. A laminated yoke or keeper is used in conjunction with this magnet and will enable the test voltage to be available on the condenser when away from the magnet, and a considerably lower voltage when placed on the magnet as a keeper. AT. is an auto-transformer, giving a suitable step up ratio to enable the maximum voltage of 450 to be obtained when 180 volts are applied across a suitable portion of its winding, the difference of 30 volts between this Contd. | ||