Douglas Harper's Etymology Dictionary
Usage examples of "straight-edge".
In order to increase the density and thereby enhance the durability of the mortar, a semicircular groove is formed along the centre, or one on each side of the joint, with an iron jointer and straight-edge.
Two lights flashed from different parts of the hills above Bassin du Sud, and he was busy with straight-edge and slide rule for a moment.
The sharp steel plowshare followed it, slicing underneath the matted grass roots, and the moldboard lifted the long, straight-edged strip of sod and turned it upside down.
And the guys put up with his straight-edge routine, not only because he was five years younger than the youngest of them, but because he was one of the funniest guys there.
In it lay two ivory-handled straight-edge razors with lethal-looking blades.
He could guess the dockyard storekeeper's answer to such a requisition: a large packet of blank paper, a box of powder for making ink, a couple of dozen quills and a few straight-edges, and the suggestion that the Calypso make use of the Seaman's Vade Mecum (which gave specimens of just about every form, voucher, list and report used in the Navy) and draw her own.