A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 55
Fig:. 49 the third, three, etc. Draw the curve through thepoints. Fig. 49. The involute is used in defining the tooth curve of agear wheel. Exercise ^9—Helix. Fig. 50. A definition of ahelix may be given as the combined vertical and hori- … MECHANICAL DRAWING 53 zontal motion of a point about a right line as an axis,no two points of the curve lying in the same plane.The upper part of Fig. 50 shows this part laid out apartfrom its application to the screw thread. Construction :Lay out the plan and elevation of the thread desired.
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Libro primo [-quinto] d'architettvra ... (1566)](https://img.insideoutlibrary.com/img/200/ia-libroprimoquinto00serl-54-80.webp)
