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).
Production test procedure for Goshawk ignition coils without the use of a jig.
| Identifier | ExFiles\Box 45\4\ Scan044 | |
| Date | 28th October 1922 | |
| Y4079 28.10.22. X.3604cl. PRODUCTION TEST OF GOSHAWK IGNITION COILS. X.4079. (Without use of Jig). (1) Continuity of primary and secondary circuits shall be tested by applying an approx. A.C. voltage of 200 to the secondary, when a small 4 volt lamp connected across the primary should be lighted. (Care should be taken to secure a definite metallic connection to the high tension terminal of the secondary winding). (2) Now test for short circuited turns in either secondary or primary, by inserting a Weston A.C. milliammeter in the supply circuit, when the milliamperes of current taken by the winding, with the primary open circuited, should not exceed the limit 13.5. (3) The high tension terminal is now connected to the central terminal of an R.R. Goshawk chassis distributor, it being supposed that the distributor is already connected in sequence to six spark gaps. The primary of the coil is connected up in series with an 8 volt battery, a standard Goshawk ballast resistance (25"), switch, ammeter, and R.R. Goshawk contact breaker with standard Goshawk condenser (.275 to .325 microfared) across its contact points, the make ratio of these latter being set to .5. (This should be periodically checked. A convenient way of doing this is to keep a small resistance made up non-inductively, which, when placed in circuit with the 12 volt battery. | ||