Hand-books of Natural Philosophy: Courses I, II.Blanchard & Lea, 1853 |
Inhoudsopgave
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Overige edities - Alles bekijken
Veelvoorkomende woorden en zinsdelen
acid action angles apparatus Argand lamp atmosphere attraction axis ball bismuth body boiling point boreal fluid boreal pole bulb centre charged chemical coating coercive force column combination combustion condensing conducting conductor copper cylinder decomposed decomposition degree density developed diathermanous dilatation direction elec electric fluid electrified electro-motive force electroscope equal equator experiments explained freezing mixtures gases glass hydrogen immersed imparted inches increase induction insulated intensity latent heat Leyden jar liquid luminous magnetic pole manner mercury metallic needle negative fluid nitric acid non-conductor observed oxygen pass phenomena pile placed plate platinum positive electricity positive fluid pressure produced quantity of heat radiation raised rays rendered repelled represented in fig repulsion sensible heat solid specific heat substances sulphuric sulphuric acid surface suspended temper temperature terrestrial thermal thermometer thermoscopic tion tricity tube vapour vertical vessel voltaic voltaic pile volume wire zinc
Populaire passages
Pagina 188 - VI. Artificial combustibles (as smelted or electrolytically deposited metals, hydrogen, phosphorus). In the present communication, known facts in natural history and physical science, with reference to the sources from which these stores have derived their mechanical energies, are adduced to establish the following general conclusions : — 1. Heat radiated from the sun (sunlight being included in this term) is the principal source of mechanical effect available to man*.
Pagina 94 - An alloy composed of 8 parts of bismuth, 5 of lead, and 3 of tin, liquefies at a temperature below that of boiling water ; and an alloy composed of 496 bismuth, 310 lead, 177 tin, and 26 mercury, fuses at !G2°-5.
Pagina 40 - Centigrade thermometer, the freezing point is marked 0°, or zero, and the boiling point 100° ; the distance between the freezing and boiling points is divided into 100 equal parts; these equal divisions are carried as far below the freezing point and above the boiling point as desired.
Pagina 180 - ... occurs. 4. When a double salt is formed by the union of two neutral salts, no disengagement of heat occurs. 5. When a neutral salt is converted into a basic salt, the combination is accompanied by the disengagement of heat.
Pagina 187 - Helmholz* in 18-17) a mechanical effect of radiant heat. In virtue of this action combustible substances are produced by plants ; and its mechanical value is to be estimated by determining the heat evolved by burning them, and multiplying by the mechanical equivalent of the thermal unit. Taking, from Liebig's Agricultural Chemistry, the estimate 2600 pounds of dry fir-wood for the annual produce of one Hessian acre, or 26,910 square feet of forest land (which in mechanical value appears not to differ...
Pagina 15 - Universities, and, in short, by those, who, having already entered upon the active pursuits of business, are still desirous to sustain and improve their knowledge of the general truths of physics, and of those laws by which the order and stability of the material world are maintained.
Pagina 159 - ... intensity of different fires, and would be an exact measure, if the precise rate of expansion could be determined." — (Turner's Chemistry.} Air Pyrometer. — In some cases the measurement of high temperatures has been attempted by means of a hollow sphere of platinum, fitted with an escape tube ; then the hotter the fire to which the platinum vessel is exposed, the greater is the quantity of air driven out of it ; and this is received over water and measured. In cases where this instrument...
Pagina 53 - ... contraction. Thus, if a pillar of metal one hundred inches in height, being raised in temperature, is augmented in height by a quarter of an inch, the force with which such increase of height is produced is equal to a weight which being placed upon the top of the pillar would compress it so as to diminish its height by a quarter of an inch. In the same manner, if a rod of metal, one hundred inches in length, be contracted by diminished temperature, so as to render its...