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The Thury thread form had the crests rounded at 1 / 6 p and the roots rounded at 1 / 5 p so the thread angle was close to 47.5° but not exactly. This was simplified in the BA thread definition by defining the thread angle to be 47.5° exactly and the thread form to be symmetrical with a depth of 3 / 5 p.
Pattern for a simple Assisi bird motif. Assisi embroidery is a form of counted-thread embroidery based on an ancient Italian needlework tradition in which the background is filled with embroidery stitches and the main motifs are outlined but not stitched.
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Echo quilting, where a quilted outline of the appliqué pattern is repeated like ripples out to the edge of the quilt, is the most common quilting pattern employed on Hawaiian-style quilts. Beautiful examples are held in the collection of the Bernice Pauahi Bishop Museum , Honolulu, Hawaii.
The trapezoidal metric thread form is similar to the Acme thread form, except the thread angle is 30°. [4] [5] [6] It is codified by DIN 103. [7] While metric screw threads are more prevalent worldwide than imperial threads for triangular thread forms, the imperially sized Acme threads predominate in the trapezoidal thread form.
A plot of the efficiency of a screw versus the thread helix angle. Cutting a single helical groove into a screw-stock cylinder yields what is referred to as a single-thread screw. Similarly, one may construct a double-thread screw provided that the helix angle of the two cuts is the same, and that the second cut is positioned in the uncut ...
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