Swivel.—A fastening with a pivot which allows the object attached to it to revolve without twisting the cord, wire, or chain, by which that object is suspended. E. G. See [Fig. 258], Chapter XVIII; and page [249].
Taper.—To make gradually smaller in diameter toward one end; to gradually diminish toward a point.
Temper.—Steel and iron tools are given their necessary degree of hardness by a process of heating and cooling, known as Tempering. Too much friction obtained while grinding a tool will destroy this temper, making it necessary to re-temper it.
Toe-nailing. See page [33].
Tongue.—The projecting edge of a tongued-and-grooved board. A projecting pin cut on a piece of wood to fit a mortise of the same shape cut in another piece of wood. Used in making Dovetail-joints. E. G. See [Figs. 208 and 209], Chapter XV.
Tongued-and-grooved Boards.—Boards with a groove along one edge and a tongue along the opposite edge, so that the tongue of one board will fit in the groove of another, thus forming a fairly tight joint. These boards are known also as Matched Boards.
Trench.—A ditch; a long channel.
Tried-edge of Work. See Testing Work, page [28].
Trim.—The wooden Casings placed around door and window openings (see [Figs. 85, 88, and 89], Chapter V).
To dress a piece of work; to cut; to make smooth.
Turnstile.—A post upon the top of which four horizontal arms are pivoted to revolve, so as to allow but one person to pass at a time (see [Fig. 266], Chapter XIX, and description of construction on page [259]).