These 15 listings are so strange that each appears in only one of the 7 encyclopedias we compared. They include such classics as Hydraulic Lift, Hydraulic Mining, Hydraulic Ram.
an apparatus on the principle of the hydraulic press, caused by means of a lever to draw up a chain which passes over sets of pulleys, and is thence conducted by leading pulleys over a jib. The weight is by this arrangement raised many times the stroke of the ram. See ELEVATOR.
Only in Collier's New Encyclopedia
a system of mining in which the force of a jet of water is used to sluice down a bed of auriferous gravel or earth, which is passed through sluices to detain the particles of gold.
Only in Collier's New Encyclopedia
a which the fall of a column of water in machine by a tube is caused to elevate a portion of itself to a height greater than that of its source.
Only in Collier's New Encyclopedia
in chemistry, H2N-NH2. Hydrazine is not known in a free state. Its derivatives are obtained by the reduction of nitrosoamines by zinc dust and acetic acid, (CH3)2N: NO + 4H' (dimethyl-nitrosomine = (CH3)2N-NH2 + HOH (dimethylhydrazine); also formed by the action of nascent hydrogen on nitrosodiethyl urea and diethyl hydrazine urea.
Only in Collier's New Encyclopedia
in chemistry, hydric iodide, hydrogen iodide, HI. Hydriodic acid is a colorless gas forming in the air. At a pressure of four atmospheres at O° it is condensed to a liquid. It can be frozen at ordinary temperature by a mixture of ether and solid Co₂ at a temperature of 55°.
Only in Collier's New Encyclopedia
or IODIDE OF ETHYL, a colorless uninflammable liquid composed of iodine and ethyl, of a sharp, pungent taste, and a penetrating ethereal odor; sp. gr. 1.94; boiling point 148° F.; sp. gr. of vapor 5.4. Formula CHI. At a red heat it is decomposed, giving off the purple vapors which are peculiar to iodine. Besides its use in the chemical laboratory as a reagent, it has attracted the attention of physicians, especially in the United States and England, land, as a remedial agent, to be administered by inhalation, in many cases in which the use of iodine is indicated. It is given in doses of 12 or 15 drops, inhaled from a napkin or sponge. In these doses, it is a gentle stimulant, and antispasmodic, but in larger quantities, and when inhaled for a considerable time, it becomes a powerful anæsthetic agent.
Only in Collier's New Encyclopedia
a mechanism in which electricity is generated by the friction of steam against rainst the sides of orifices through which it is allowed to escape under high pressure.
Only in Collier's New Encyclopedia
HBr, a colorless gas, occurring in solution as a colorless, odorless liquid, with a specific gravity of 1.077. Formed when hydrogen and bromine vapor are passed over warm platinum sponge, or when potassium bromide is distilled with phosphoric acid. Used in medicine as a sedative, and in the preparation of various organic compounds.
Only in Collier's New Encyclopedia
a name given to compounds of one or more atoms of carbon, with atoms of hydrogen. Carbon is a tetrad element, capable of uniting with four atoms of H, as CH4 methane. But carbon atoms can unite with each other, by one or more pair of bonds. Hydrocarbons having the C atoms united by only one pair of bonds are called paraffins, Cn: H2n+2:, as ethane. Hydrocarbons having two C atoms united by two pairs of bonds are called olefines Cn H₂n:, as ethene. By three pairs of bonds, are called acetylenes CnH2n-2 as acetylene. Besides these there are hydrocarbons belonging to the aromatic series, having the carbon atoms arranged to form a closed ring, as BEN- ZENE, C.He (q. v.), and the naphthalene series containing two closed rings. The constitution of the other groups of hydrocarbons is described under their respective names.
Only in Collier's New Encyclopedia
A furnace having special burners suitable for using liquid fuel. The burners consist of an apparatus which allows a forced jet of air and steam to carry with them a certain quantity of petroleum which is distributed into the furnace in the form of spray, and there burns with an intensity proportionate to the amount of fuel supplied. Hydrogen is the lightest substance known, and possesses nearly all the properties of a non-metal in such perfection, that chemists have long hesitated to class it with the metals, though its chemical relations clearly show it to belong to that class of elements. It combines with nearly every non-metal, but with only two or three of the metals. Hydrogen is colorless, tasteless, and inodorous when quite pure. It is inflammable, and burns with a pale yellowish flame, evolving much heat but very little light. The result of the combustion is water. It has never been liquefied, and is even less soluble in water than oxygen. It is incapable of sustaining life, but contains no poisonous properties. Hydrogen is never found free in nature, but exists abundantly in combination, forming one ninth by weight of water, and a considerable proportion of all organized substances. It is the lightest of all known substances, being 16 times lighter than oxygen and 14 1/2 times lighter than air; its density is placed at 0.0692 referred to that of air as unity, 100 cubic inches weighing about 2.14 grains.
Only in The Encyclopedia of Founding
a form of dropsy in the ventricles of the brain, or in the arachnoid cavity, in children, and usually rapidly fatal, though cases have been known to go on to adult life.
Only in Collier's New Encyclopedia
(HCl), a gaseous compound of equal volumes of hydrogen and chlorine. It is evolved during volcanic eruptions, and is found in the water which collects in the crevices of mountains, as well as in rivers which take their rise in volcanic formations, especially in South America. It may be produced by decomposing common salt with sulphuric acid (2Na Cl+ H2SO4 =2HCl + Na2SO4), or by bringing equal volumes of chlorine and hydrogen together and exposing the mixture to diffused daylight with condensation, as it explodes in direct sunlight.
Only in Collier's New Encyclopedia
cyanide of hydrogen, hydric cyanide, hydrogen cyanide, prussic acid. Discovered by Scheele in 1782.
Only in Collier's New Encyclopedia
a department of science which treats of the nature of liquids in motion, as opposed to hydrostatics, which investigates the condition ondition of their equilibrium when at rest.
Only in Collier's New Encyclopedia
hydrogen fluoride, fluoride of hydrogen, hydric fluoride, HF. The anhydrous acid is obtained by neutralizing in a platinum dish the aqueous solution of hydrofluoric acid with caustic potash, and evaporating the solution.
Only in Collier's New Encyclopedia