—Let the distance of the first pin at b fromthe pencil at a, be equal to half the shortestaxis, and the distance of the second pin at cfrom A, to half the longest axis; the pins beingput in the grooves, move the pencil at a, whichwill describe the ellipsis, h is a hair compass,with two steel… … using it is to open the compass to nearly therequired extent, and then to turn the screwand adjust the points to the necessary distanceI is generally known by the name of springdividers, they are employed similarly to theabove, and are applied to the same purpose. Compassing (in naval…
Design · Decoration and ornament · Art
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