Machine drawing, a practical guide to the standard methods of graphical representation of machines, including complete detail drawings of a duplex pump and of a direct-current generator (1920)
Griffin, Charles Lewis, 1867- [from old catalog], Adams, Charles Clyde, 1882- [from old catalog] joint author · Chicago, American technical society · leaf 85
ne point on theprojection of the helix. The points M, N, etc., are found in thesame manner. A smooth curve starting from A, going through allthe points and ending at E, will be the projection of one turn ofthe helix. The half from A to R is on the front, and is, therefore, 72 MACHINE DRAWING a full… … Fig. 53. £/23456789 10 It 12 IDiagram of Left-Hand Helix Curve CR is just one-half the pitch. The curve from E to B is the pro-jection of the next turn of the helix and is exactly like the first one. The helix shown in Fig. 52 is called a right-hand helix. Ifthe curve starts at C and is drawn as in…
Machinery
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