Philosophical MagazineTaylor & Francis., 1878 |
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الصفحة 9
... becomes d ( 풍 ) H - 1 de = 0 . dt Jtdt Eliminating e from this by ( 4 ) , we have and , eliminating H , This is equivalent to t dw H = --- ; • J dt dw e = w - t dt dw e = eo + w - t ; dt ( 5 ) ( 6 ) ( 7 ) • ( 8 ) or , if No denote the ...
... becomes d ( 풍 ) H - 1 de = 0 . dt Jtdt Eliminating e from this by ( 4 ) , we have and , eliminating H , This is equivalent to t dw H = --- ; • J dt dw e = w - t dt dw e = eo + w - t ; dt ( 5 ) ( 6 ) ( 7 ) • ( 8 ) or , if No denote the ...
الصفحة 10
... becomes in the par- ticular case of each of these elements being maintained at a constant value ; or , which is the ... become reduced at once to the forms investigated specially for fluids in my previous communications . Thus , if the ...
... becomes in the par- ticular case of each of these elements being maintained at a constant value ; or , which is the ... become reduced at once to the forms investigated specially for fluids in my previous communications . Thus , if the ...
الصفحة 11
... becomes where dt + t dp JK = de +1 ( d ) , dt dt dt expresses the assumed relation between the natu- rally independent variables v , t . If this be such that the pres- sure is constant , we have dv dp dt dt dp - dv and , K being now the ...
... becomes where dt + t dp JK = de +1 ( d ) , dt dt dt expresses the assumed relation between the natu- rally independent variables v , t . If this be such that the pres- sure is constant , we have dv dp dt dt dp - dv and , K being now the ...
الصفحة 12
... becomes strained into a cube of unit dimensions , when the solid is in the particular state at which we wish to investigate its thermoelastic properties . 12. If then we take x 。= 1 , y 。= 1 , z = 1 , §。= 1π , No = 1π , & = 1π , and ...
... becomes strained into a cube of unit dimensions , when the solid is in the particular state at which we wish to investigate its thermoelastic properties . 12. If then we take x 。= 1 , y 。= 1 , z = 1 , §。= 1π , No = 1π , & = 1π , and ...
الصفحة 14
... become augmented by da , dy , & c . respectively will be Pdx + Qdy + Rdz + Sd§ + Tdŋ + Uds . Hence , if the portion of matter of which the intrinsic energy is denoted by e , and to which the notation e , w , & c . applies , be the ...
... become augmented by da , dy , & c . respectively will be Pdx + Qdy + Rdz + Sd§ + Tdŋ + Uds . Hence , if the portion of matter of which the intrinsic energy is denoted by e , and to which the notation e , w , & c . applies , be the ...
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according acid action æther angle apparatus ball calorimeter capillary carbon centims centre centrifugal force chain chemical chloride circuit conductor constant copper crystals curve deflection deposits determined direction disk distance drachms drop edge edge-angle effect elastic electricity electrodes electrolysis electromotive force elements employed equal equation experiments film fluid galvanic galvanometer gases glass gravity greater heat horizontal hydrogen hypobromite incidence increased india-rubber induction junction kinetic theory light lines liquid magnetic mass means measured mercury metal method millim millimetres molecular molecules motion observed obtained oxygen particles passing Phil plane plate platinum platinum wire Pogg polariscope polarization position pressure produced pulley quantity radius resistance right-handed rocks rotation second Nicol selenium shown side Siemens unit solid body solution Spark-discharge substance sulphuric acid surface surface-tension temperature tension tion tube unit urea vapour velocity vibrations weight zinc
مقاطع مشهورة
الصفحة 73 - In this instrument the usual action of light is reversed, rotation taking place, the bright convex side being repelled, and the black concave attracted. When the light shines only on the bright convex side, no movement is produced, but when it shines on the black concave side, this is attracted, producing rotation. 15. Radiometer. — A cup-shaped radiometer similar to the above, but having the convex surfaces black and the concave bright. Light shining on this instrument causes it to rotate rapidly,...
الصفحة 73 - Exposed to a standard candle 3-5 inches off, the fly rotates continuously at the rate of one revolution in 3'37 seconds. A screen placed in front...
الصفحة 71 - ... the latter, causing continuous rotation at the rate of one revolution in 7'5 seconds. When the convex side is screened off, so as to let the light shine only on the concave...
الصفحة 3 - ... between the pressure of a fluid, and the thermal capacities and mechanical energy of a given mass of it, all considered as functions of the temperature and volume ; and Carnot's function of the temperature ; are brought forward for the purpose of pointing out the importance of making the mechanical energy of a fluid in different states an object of research, along with the other elements which have hitherto been considered, and partially investigated in some cases. 84. If we consider the circumstances...
الصفحة 17 - If a wire already twisted be suddenly twisted further, always, however, within its limits of elasticity, cold will be produced ; and if it be allowed suddenly to untwist, heat will be evolved from itself (besides heat generated externally by any work allowed to be wasted, which it does in untwisting). It is assumed that the torsional rigidity of the wire is diminished by an elevation of temperature, as the writer of this article had found it to be for copper, iron, platinum, and other metals (compare...
الصفحة 232 - Prize to be adjudged in 1877 : The Criterion of Dynamical Stability. To illustrate the meaning of the question imagine a particle to slide down inside a smooth inclined cylinder along the lowest generating line, or to slide down outside along the highest generating line. In the former case a slight derangement of the motion would merely cause the particle to oscillate about the generating line, while in the latter case the particle would depart from the generating line altogether. The motion in the...
الصفحة 17 - From thermodynamic theory* it is concluded that cold is produced whenever a solid is strained by opposing, and heat when it is strained by yielding to, any elastic force of its own, the strength of which would diminish if the temperature were raised ; but that, on the contrary, heat is produced when a solid is strained against, and cold when it is strained by yielding to, any elastic force of its own, the strength of which would increase if the temperature were raised.
الصفحة 69 - ... the force impinging on it. By having the driving surface of large size, and making it of a good conductor of heat, such as silver, gold, or copper, a very faint amount of incident radiation suffices to produce motion. The black surface acts as if a molecular* wind were blowing from it, principally in a direction normal to the surface. This wind blows away whatever easily movable body happens to be in front of it, irrespective of colour, shape, or material ; and in its capability of deflection...
الصفحة 337 - The experiments were made upon wires of iron, steel, and copper, the copper wire employed having been obtained from Messrs. Johnson, Matthey & Co. as chemically pure. Two tin cans were obtained open at the top, and pierced at the bottom by necks into which india-rubber corks were inserted ; and through slits in these the wires were passed. The wire was fastened by a clamp in the lower can, and was grasped in the upper one by a pair of wire-drawing dogs attached to the shorter arm of a lever, to the...
الصفحة 74 - Shone, W., On the Glacial Deposits of West Cheshire, together with Lists of the Fauna found in the Drift of Cheshire and Adjoining Counties.