Part 5476

<hw>Hy`dro*qui"none</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Hydro-</ets>, 2 + <ets>quinone</ets>.]</ety> <fld>(Chem.)</fld> <def>A white crystalline substance, <chform>C6H4(OH)2</chform>, obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin. Called also <altname>dihydroxy benzene</altname>.</def>

<h1>Hydrorhiza</h1> <Xpage=717>

<hw>Hy`dro*rhi"za</hw> <tt>(?)</tt>, <tt>n.</tt>; <plu>pl. L. <plw>Hydrorhiz\'91</plw> <tt>(#)</tt>, E. <plw>Hydrorhizas</plw> <tt>(#)</tt></plu>. <ety>[NL., fr. E. <ets>hydra</ets> + Gr. <?/ a root.]</ety> <fld>(Zo\'94l.)</fld> <def>The rootstock or decumbent stem by which a hydroid is attached to other objects. See <i>Illust</i>. under <er>Hydroidea</er>.</def>

<h1>Hydrosalt</h1> <Xpage=717>

<hw>Hy"dro*salt`</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Hydro-</ets>, 1 + <ets>salt</ets>.]</ety> <fld>(Chem.)</fld> <sd>(a)</sd> <def>A salt supposed to be formed by a hydracid and a base.</def> <sd>(b)</sd> <def>An acid salt.</def> <mark>[R.]</mark> <sd>(c)</sd> <def>A hydrous salt; a salt combined with water of hydration or crystallization.</def>

<hr> <page="718"> Page 718<p>

<h1>Hydroscope</h1> <Xpage=718>

<hw>Hy"dro*scope</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Hydro-</ets>, 1 + -<ets>scope</ets>.]</ety> <p><b>1.</b> <def>An instrument designed to mark the presence of water, especially in air.</def>

<i>Weale.</i>

<p><b>2.</b> <def>A kind of water clock, used anciently for measuring time, the water tricking from an orifice at the end of a graduated tube.</def>

<h1>Hydrosome, Hydrosoma</h1> <Xpage=718>

<hw><hw>Hy"dro*some</hw> <tt>(?)</tt>, <hw>Hy`dro*so"ma</hw> <tt>(?)</tt><hw>, <tt>n.</tt> <ety>[NL. <ets>hydrosoma</ets>. See <er>Hydra</er>, and <er>-some</er> body.]</ety> <fld>(Zo\'94l.)</fld> <def>All the zooids of a hydroid colony collectively, including the nutritive and reproductive zooids, and often other kinds.</def>

<h1>Hydrosorbic</h1> <Xpage=718>

<hw>Hy`dro*sor"bic</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Hydro-</ets>, 2 + <ets>sorbic</ets>.]</ety> <fld>(Chem.)</fld> <def>Pertaining to, or designating, an acid obtained from sorbic acid when this takes up hydrogen; <as>as, <ex>hydrosorbic</ex> acid</as>.</def>

<h1>Hydrostat</h1> <Xpage=718>

<hw>Hy"dro*stat</hw> <tt>(?)</tt>, <tt>n.</tt> <def>A contrivance or apparatus to prevent the explosion of steam boilers.</def>

<h1>Hydrostatic, Hydrostatical</h1> <Xpage=718>

<hw><hw>Hy`dro*stat"ic</hw> <tt>(?)</tt>, <hw>Hy`dro*stat"ic*al</hw> <tt>(?)</tt>,<hw> <tt>a.</tt> <ety>[<ets>Hydro-</ets>, 1 + Gr. <?/ causing to stand: cf. F. <ets>hydrostatique.</ets> See <er>Static</er>.]</ety> <def>Of or relating to hydrostatics; pertaining to, or in accordance with, the principles of the equilibrium of fluids.</def>

<blockquote>The first discovery made in <b>hydrostatics</b> since the time of Archimedes is due to Stevinus. <i>Hallam.</i></blockquote>

<cs><col>Hydrostatic balance</col>, <cd>a balance for weighing substances in water, for the purpose of ascertaining their specific gravities.</cd> -- <col>Hydrostatic bed</col>, <cd>a water bed.</cd> -- <col>Hydrostatic bellows</col>, <cd>an apparatus consisting of a water-tight bellowslike case with a long, upright tube, into which water may be poured to illustrate the hydrostatic paradox.</cd> -- <col>Hydrostatic paradox</col>, <cd>the proposition in hydrostatics that any quantity of water, however small, may be made to counterbalance any weight, however great; or the law of the equality of pressure of fluids in all directions.</cd> -- <col>Hydrostatic press</col>, <cd>a machine in which great force, with slow motion, is communicated to a large plunger by means of water forced into the cylinder in which it moves, by a forcing pump of small diameter, to which the power is applied, the principle involved being the same as in the hydrostatic bellows. Also called <altname>hydraulic press</altname>, and <altname>Bramah press</altname>. In the illustration, <figref>a<figref> is a pump with a small plunger <figref>b<figref>, which forces the water into the cylinder <figref>c</figref>, thus driving upward the large plunder <figref>d</figref>, which performs the reduced work, such as compressing cotton bales, etc.</cd></cs>

<h1>Hydrostatically</h1> <Xpage=718>

<hw>Hy`dro*stat"ic*al*ly</hw>, <tt>adv.</tt> <def>According to hydrostatics, or to hydrostatic principles.</def>

<i>Bentley.</i>

<h1>Hydrostatician</h1> <Xpage=718>

<hw>Hy`dro*sta*ti"cian</hw> <tt>(?)</tt>, <tt>n.</tt> <def>One who is versed or skilled in hydrostatics.</def> <mark>[R.]</mark>

<h1>Hydrostatics</h1> <Xpage=718>

<hw>Hy`dro*stat"ics</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[Cf. F. <ets>hydrostatique</ets>.]</ety> <fld>(Physics)</fld> <def>The branch of science which relates to the pressure and equilibrium of nonelastic fluids, as water, mercury, etc.; the principles of statics applied to water and other liquids.</def>

<h1>Hydrosulphate</h1> <Xpage=718>