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d spars in order from the deck; as, the topgallant mast, yards, braces, and the like. See Illustration of Ship.

e gaff. See Cutter, Schooner, Sail, and Ship. Topsail schooner. (Naut.) See Schooner, and Illustration in Appendix.

f or pertaining to the Trematodea. See Illustration in Appendix.

ng the same or a similar purpose, but composed of several steps, or offsets. Thus, in the illustration, a is the tusk, and each of the several parts, or offsets, is called a tooth.

ion is given to the valve or valves for the distribution of steam in the cylinder. For an illustration of one form of valve gear, see Link motion. -- Valve seat. (Mach.) (a) The fixed surface on which a valve rests or against which it presses. (b) A part or piece on which such a surface is formed. -- Valve stem (Mach…

The external male organ of certain mollusks, worms, etc. See Illustration in Appendix.

y one of numerous species of small Turbellaria belonging to Vortex and allied genera. See Illustration in Appendix. Vortex atom (Chem.), a hypothetical ring-shaped mass of elementary matter in continuous vortical motion. It is conveniently regarded in certain mathematical speculations as the typical form and structure…

umenius phæopus), called also Jack curlew, half curlew, stone curlew, and tang whaup. See Illustration in Appendix. Hudsonian or, Eskimo, whimbreal, the Hudsonian curlew.

a schooner in that the after mast is very small, and stepped as far aft as possible. See Illustration in Appendix.