Better Late Available to Purchase

WE publish in this issue the third and final instalment of an exhaustive survey of the spring tab—a device to make somewhat easier the onerous task of the pilot in controlling his mount at the high speeds of modern flight. We feel that it is only fair to MR F. B. BAKER, the author, that we should make it clear that his article was written over two years ago and was, in fact, submitted to us so long ago as November 1945. The long—and, we readily admit, from his point of view unconscionable—delay has been due to the difficulties of setting the somewhat complicated mathematics involved, combined with the problem of finding space in three successive issues for a paper of this length. The mathematical incubus has been so much the burthen of our monthly song in recent issues that we will refrain from enlarging on it again here, except to emphasize that this is an example of the effect it can have in holding up the appearance of a contribution.