d to reverse it inthe same socket, b is a larger compass of theame description, having a moveable point, inorder to admit of the pen or pencil beingattached to it. c is a triangular or three-leggedcompass, similar to the common one, only thatit has an additional leg fitting to the head by ajoint or… … employed, d is a proportional compass, con-sisting of two flat pieces of brass, pointed ateach end with steel, and laid one upon theother, so as to appear when shut but onepiece. These pieces slide one over another,moving round a sliding centre, along a grooveor channel, cut through nearly the…
Design · Decoration and ornament · Art
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