Chapter VIII. Screw Threads and Spirals

Screw threads for small bolts with the angles of the thread drawn in, and the method of doing this

A double thread; a round top and bottom thread such as the Whitworth thread; a left hand thread; to draw screw threads of a large diameter

Drawing the curves for screw threads

To draw the United States standard thread

To draw a square thread

Form of template for drawing the curves of threads

To show the thread depth in a top or end view of a nut; to draw a spiral spring

To obtain an accurate division of the lines that divide the pitch