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acid with certain aromatic bases (as benzene); as, phenyl sulphonic acid, C6H5.SO2.OH, a stable colorless crystalline substance. Sulphonic group (Chem.), the hypothetical radical, SO2.OH, the characteristic residue of sulphonic acids.

ge (Mach.), an instrument consisting of a standard having a flat base and carrying an adjustable pointer, for gauging the evenness of a surface or its height, or for marking a line parallel with a surface. -- Surface grub (Zoöl.), the larva of the great yellow underwing moth (Triphoena pronuba). It is often destructiv…

ice consisting essentially of a variable inductance coil and condenser with a pair of adjustable spark balls, for attuning the time periods of antennæ in wireless telegraphy (called also syntonizing coil).

The sliding block or support, in a lathe, which carries the dead spindle, or adjustable center. The headstock supports the live spindle.

s, which are more or less interchangeable, according as one form or the other is the more stable. It is a special case of metamerism; thus, the lactam and the lactim compounds exhibit tautomerism.

An adjustable traveling bag consisting of two cases, the larger slipping over the other.

with, or with a roof of, straw, reeds, or some similar substance; as, to thatch a roof, a stable, or a stack of grain.

Of, pertaining to, or designating, an unstable acid, H2S2O3, analogous to sulphuric acid, and formerly called hyposulphurous acid.

An under constable. Shak. Johnson.

Wavering, or liable to waver and fall at the slightest touch; unstable; easily overthrown. [Obs.] Thy head stands so tickle on thy shoulders, that a milkmaid, if she be in love, may sigh it off. Shak.

so as to be liable to totter and fall at the slightest touch; unfixed; easily affected; unstable. Can any man with comfort lodge in a condition so dismally ticklish Barrow.

An officer who bears a staff tipped with metal; a constable. Macaulay.

A peace officer; an under constable.

ibrations. It consists of two thin slips of steel welded together, their length being adjystable by a screw socket.

y carefully. My purpose is to traverse the nature, principles, and properties of this detestable vice -- ingratitude. South.

Adjustable laterally; having a lateral motion, or a swinging motion; adapted for giving lateral motion. Traversing plate (Mil.), one of two thick iron plates at the hinder part of a gun carriage, where the handspike is applied in traversing the piece. Wilhelm. -- Traversing platform (Mil.), a platform for traversing g…

To render unstable or wavering; to unsettle; as, to unhinge one's mind or opinions; to unhinge the nerves. Why should I then unhinge my brains, ruin my mind South. His sufferings, nay the revolutions of his fate, had not in the least unhinged his mind. Walpole.

w, how variable and vain! Milton. Variable exhaust (Steam Eng.), a blast pipe with an adjustable opening. -- Variable quantity (Math.), a variable. -- Variable stars (Astron.), fixed stars which vary in their brightness, usually in more or less uniform periods.

lying, or having the wings spread; as, an eagle volant. Volant piece (Anc. Armor), an adjustable piece of armor, for guarding the throat, etc., in a joust.

Changeable; unstable; fickle. [Obs.]