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e primary planets. It is about 1,800,000,000 miles from the sun, about 36,000 miles in diameter, and its period of revolution round the sun is nearly 84 of our years.

The estimation of the specific gravity of urine by the urinometer.

the danger of burning the sugar, and shortens the process. -- Vacuum pump. Same as Pulsometer, 1. -- Vacuum tube (Phys.), a glass tube provided with platinum electrodes and exhausted, for the passage of the electrical discharge; a Geissler tube. -- Vacuum valve, a safety valve opening inward to admit air to a vesse…

of a movable, open-ended, turban-shaped shell provided with two faces of nearly equal diameters, one above another, which rest upon two corresponding seats when the valve is closed. -- Equilibrium valve. (a) A balance valve. See under Balance. (b) A valve for permitting air, steam, water, etc., to pass into or out of…

r by water, air, or other fluid; as, the vane of a screw propeller, a fan blower, an anemometer, etc.

ure only, and may be measured by introducing a small quantity of the substance into a barometer and noting the depression of the column of mercury.

and that of the Earth, at a mean distance from the sun of about 67,000,000 miles. Its diameter is 7,700 miles, and its sidereal period 224.7 days. As the morning star, it was called by the ancients Lucifer; as the evening star, Hesperus.

the divisions of a graduated instrument, as the limb of a sextant, or the scale of a barometer, for indicating parts of divisions. It is so graduated that a certain convenient number of its divisions are just equal to a certain number, either one less or one more, of the divisions of the instrument, so that parts of a…

a native of Guiana and Brazil. Its large, spreading leaves are often over five feet in diameter, and have a rim from three to five inches high; its immense rose-white flowers sometimes attain a diameter of nearly two feet.

specific gravity is referred to water at 4º C. as a standard) to the number of cubic centimeters occupied by one gram of the substance.

The method or process of measuring volumes by means of the volumenometer.

asured by burettes, pipettes, etc.; also, the analysis of gases by volume, as by the eudiometer.

A genus of minute, pale-green, globular, organisms, about one fiftieth of an inch in diameter, found rolling through water, the motion being produced by minute colorless cilia. It has been considered as belonging to the flagellate Infusoria, but is now referred to the vegetable kingdom, and each globule is considered a…

A small timepiece, or chronometer, to be carried about the person, the machinery of which is moved by a spring.

A hydrometer.

An instrument for measuring the distance which one has traveled on the road; an odometer, pedometer, or perambulator. The waywiser to a coach, exactly measuring the miles, and showing them by an index. Evelyn.

at a given hour and over an extended region. Such maps usually show the height of the barometer, the temperature of the air, the relative humidity, the state of the weather, and the direction and velocity of the wind. Isobars and isotherms outline the general distribution of temperature and pressure, while shaded areas…

phere, especially changes of atmospheric pressure, and hence changes of weather, as a barometer or baroscope. Poor man's weatherglass. (Bot.) See under Poor.

edge (Geom.), the portion of a sphere included between two planes which intersect in a diameter.

orated to receive wooden cogs; the skeleton of a mortise gear. -- Measuring wheel, an odometer, or perambulator. -- Wheel and axle (Mech.), one of the elementary machines or mechanical powers, consisting of a wheel fixed to an axle, and used for raising great weights, by applying the power to the circumference of the…