The Pirani EfTect in a Thermionic Filament as a Means of Measuring Low Pressures Although in the work carried out at Exeter and described in the paper which I communicated to you and which appeared in your May issue, Dr. L. Speirs (not Spiers) was associated with Mr. Jolly, he is not, in fact, a joint author of the paper.
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V G W Harrison (1950) studied this question.