ClipArt ETC
"Gaff. B, boom; CC, cheeks; G, gaff; M, mast; P, peak; T, throat or jaw. Nautical, a spar used to extend the upper edge of fore-and-aft sails which are not set on stays, as the mainsail of a sloop or spanker of a ship." -Whitney, 1911

Gaff Rig

"Gaff. B, boom; CC, cheeks; G, gaff; M, mast; P, peak; T, throat or jaw. Nautical, a spar used to extend…

"Bisecting gage, a gage formed by a bar carrying two heads or cheeks connected by two arms of equal length, forming a toggle-joint, at which a pencil or scribe-awl is placed. The pencil or awl is thus at equal distances from the cheeks at whatever gage they may be set." -Whitney, 1911

Bisecting Gauge

"Bisecting gage, a gage formed by a bar carrying two heads or cheeks connected by two arms of equal…