NASA NTRS · 19860000263
Parallel-End-Point Drafting Compass
Abstract
Parallelogram linkage ensures greater accuracy in drafting and scribing. Two members of arm of compass remain parallel for all angles pair makes with hub axis. They maintain opposing end members in parallelism. Parallelogram-linkage principle used on dividers as well as on compasses.
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Cronander, J.. 1986-05-01. Parallel-End-Point Drafting Compass. https://ntrs.nasa.gov/citations/19860000263
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