The furrows or cracks, A and.B, are produced by running the diamonds over the face* of the stone by the side of a straight ruler. The curved lines, as represented at C, are made by operating the ...
Image caption, STEP 4: Mark the two points where the curved arcs cross each other. Then use a ruler to draw a line joining the points. STEP 2: Put the pin of the compass at the point of the angle.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback