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).
Table of measurements and observations for different annular gap configurations and resulting coronal discharge.
Identifier | ExFiles\Box 54\3\ Scan249 | |
Date | 8th October 1924 | |
-3a- 8.10.24. X.4645. ANNULAR GAPS. | Gap particulars. | Spindle dia. (a) (mm.) (Inches) | Hole dia. (b) (mm.) (Inches) | Gap (mm) (b-a)/2 | b/a | a/b | Remarks. | |---|---|---|---|---|---|---| | M.L.Gap originally. | 1.3 .051 | 6.42 .253 | 2.56 | 5.01 | .20 | Invisible but audible coronal discharge. | | Lucas gap originally. | 1.85 .073 | 8.65 .348 | 3.5 | 4.78 | .21 | Visible and audible coronal discharge. | | Lucas gap Our set A.{Mr Adams} (std). | 2.21 .087 | 8.25 .325 | 3.02 | 3.74 | .27 | Invisible but audible coronal discharge. | | Lucas gap Our set B. | 2.54 .100 | 7.95 .312 | 2.70 | 3.12 | .32 | Ditto. | | Lucas gap Our set C. | 3.17 .125 | 7.95 .312 | 2.39 | 2.50 | .40 | Very slight audible discharg | EFC. | ||