RING n.
ne, pyridine, etc. See Illust. under Benzene. -- Ring mail, a kind of mail made of small steel rings sewed upon a garment of leather or of cloth. -- Ring micrometer. (Astron.) See Circular micrometer, under Micrometer. -- Saturn's rings. See Saturn. -- Ring ousel. (Zoöl.) See Ousel. -- Ring parrot (Zoöl.), any one…
ROMAN a.
its freedom from iron. -- Roman balance, a form of balance nearly resembling the modern steelyard. See the Note under Balance, n., 1. -- Roman candle, a kind of firework (generally held in the hand), characterized by the continued emission of shower of sparks, and the ejection, at intervals, of brilliant balls or st…
SAW n.
ing or dividing substances, as wood, iron, etc., consisting of a thin blade, or plate, of steel, with a series of sharp teeth on the edge, which remove successive portions of the material by cutting and tearing.
SCREW n.
aves. -- Screw plate, a device for cutting threads on small screws, consisting of a thin steel plate having a series of perforations with internal screws forming dies. -- Screw press, a press in which pressure is exerted by means of a screw. -- Screw propeller, a screw or spiral bladed wheel, used in the propulsion…
SELF-HARDENING a.
Designating, or pert. to, any of various steels that harden when heated to above a red heat and cooled in air, usually in a blast of cold air with moderate rapidity, without quenching. Such steels are alloys of iron and carbon with manganese, tungsten and manganese, chromium, molybdenum and manganese, etc. They are chi…
SHEAR n.
of the blades of shears or a shearing machine. -- Shear hulk. See under Hulk. -- Shear steel, a steel suitable for shears, scythes, and other cutting instruments, prepared from fagots of blistered steel by repeated heating, rolling, and tilting, to increase its malleability and fineness of texture.