Twisden, John Francis · London, Longmans, Green, and Co. · leaf 118
face of thetriangle or the other isturned inward, the oneproduces what is called aright-handed, the other aleft-handed, helix. Fig.88 shows a right-handedhelix. The relation be-tween this curve and anordinary square threadedscrew will be evident onan inspection of the ac-companying figure (89),… … FlG.S!).
Mechanics, Analytic
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