The insulation extends to the back of the cylindro‐conical head of the central electrode. Longitudinal ridges 7 on the head are situated opposite or extend between narrow fingers 8 depending from the threaded end of the casing. Through the intervening ports the insulator is directly exposed to the combustion gases. A cylindrical annular space extends between the casing and insulation back to the seating of the flanges.
(1933), "Month in the Patent Office: A Selection of the More Important Aircraft and Engine Specifications Published Recently", Aircraft Engineering and Aerospace Technology, Vol. 5 No. 7, pp. 166-166. https://doi.org/10.1108/eb029701
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