Abstract
Mr. Hensel’s discussion is a positive contribution to an understanding of curvature effects. I am especially grateful to learn of Talwani’s formula, which had not only escaped my search, but also that of the several reviewers, one of whom expended some effort on the matter. Dr. Bob Bean has pointed out two additional references (Lejay, 1947; Qureshi, 1976). Although there is no way to be sure, I doubt that Sir Edward Bullard used an earth radius substantially in error. [The radius at mid‐latitudes was known to be greater than 6365 km much earlier (Dana, 1871.)] It seems more likely to me that the Cassinis tables (or the way they were used) addressed a somewhat different model, perhaps including that part of the spherical sector which is labeled as “C” in Figure A‐1 in my paper.
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