Page:Miscellaneous Papers on Mechanical Subjects.djvu/98

The amount of turn to be given must be considered with relation to the charges intended to be used and the length of the gun, but should be as quick as possible, since the extent of true steady flight, in the case of a long projectile, depends on the rotation given to it For a great range, length of gun is requisite, as it provides for the consumption of large charges of powder, but the quick turn, which is so desirable, limits the length that can be used. The best combinations and proportions can only be arrived at after careful experiment.

I would observe, before concluding this paper, that it has been drawn up rather with the view of offering some reply to many inquiries, than with the intention of giving a detailed account of what has been done, or of presenting a complete treatise on the subject.

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Note.—It is right to state that, from the time I first undertook, at the solicitation of the Government, to render what assistance I could in the improvement of rifled arms; I have always devoted my time and attention to them, without any renumeration whatever, even for personal expenses. The sums required have been advanced by myself; periodical accounts are sent in to the Government, and the advances have been repaid at its convenience.