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).
Establishing a standard for chemical leak utility tests for magneto and battery ignition systems.
| Identifier | ExFiles\Box 54\5\ Scan265 | |
| Date | 5th May 1924 | |
| X 3485 EFC. {E. Fowler Clarke - Electrical Engineer} 5.5.24. WA. {Mr Wallis} 28. CHEMICAL LEAK FOR UTILITY TESTS ON MAGNETO AND BATTERY IGNITION. After considerable experimental work the conductance of the above has been fixed at a suitable figure. This is (see PB.85) 4 micromhos at a temperature of 20oC. As the conductance varies considerably with small changes of temperature, observations were made of the increase in resistance per degree centigrade with a view to arriving at a suitable average figure, for temperature correction. The observations were as follows :- 16oC 3.1 micromhos. 17 3.4 18 3.6 19 3.8 20 4.0 21 4.35 22 4.7 23 5.1 This gives an average variation of conductance per degree Centigrade of .28 micromhos. EFC {E. Fowler Clarke - Electrical Engineer} /HEW. | ||