Transactions of the Cambridge Philosophical SocietyUniversity Press, 1838 |
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الصفحة 56
... intersections , and consequently the fissures in this transverse system will not be parallel . Again , if we suppose the superficies of our elevated mass to be of finite length , and to be bounded for instance by a line approximating to ...
... intersections , and consequently the fissures in this transverse system will not be parallel . Again , if we suppose the superficies of our elevated mass to be of finite length , and to be bounded for instance by a line approximating to ...
الصفحة 58
... intersections of the two perpendicular systems of veins ( metalliferous veins and cross courses ) that the most important of the phenomena we are about to consider are found , while others occur at the intersections of veins of more ...
... intersections of the two perpendicular systems of veins ( metalliferous veins and cross courses ) that the most important of the phenomena we are about to consider are found , while others occur at the intersections of veins of more ...
الصفحة 59
... intersections of veins , described in the Introduction ( II . o , π , p , ) the broken veins are generally supposed to have been originally continuous , and to have been broken by a relative movement of the portions of the mass on ...
... intersections of veins , described in the Introduction ( II . o , π , p , ) the broken veins are generally supposed to have been originally continuous , and to have been broken by a relative movement of the portions of the mass on ...
الصفحة 62
... intersections of these veins with the exterior surface will present the appearance represented in ( Fig . 4 ) . 64. The case just described is admirably calculated to afford a decisive test , as to whether these phenomena have , or have ...
... intersections of these veins with the exterior surface will present the appearance represented in ( Fig . 4 ) . 64. The case just described is admirably calculated to afford a decisive test , as to whether these phenomena have , or have ...
الصفحة 63
... intersections with the horizontal surface , and the length of the line CC " , which evi- dently measures the throw of the unbroken vein AB , produced by the supposed movement . To express the horizontal displacement of the vein in terms ...
... intersections with the horizontal surface , and the length of the line CC " , which evi- dently measures the throw of the unbroken vein AB , produced by the supposed movement . To express the horizontal displacement of the vein in terms ...
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عبارات ومصطلحات مألوفة
a₁ æther Anemometer angles anticlinal appears approximation assume axes axis co-ordinates coefficients Comet consequently considered cos² Crown Glass density determined direction distance dx² elevation elevatory force equal equation expression extrados finite fissure Flint Glass fluid foliis formula function goniatites Hence horizontal hypothesis integral intersection lamina line of resistance Maderæ mass Maxillæ medium mineral veins motion nearly observed obtain parallel particles perpendicular phenomena pinnules plane portion position pressure produced propagated quantity rays refractive refractive index represented respectively shew shewn sin² siphuncle solution Star suppose surface tension theory tion toadstone transmission transverse triangle values velocity vertical vibration wave wave-surface y₁ Λ Λ
مقاطع مشهورة
الصفحة 349 - ... a consequence of the rule that the difference of the squares of the velocities of the ordinary and extraordinary rays within the crystal, is proportional to the product of the sines of the angles which the latter makes with the resultant axes. M. Biot was led to the discovery of this beautiful law by analogyf, and he afterwards observed that it was implicitly contained in the law proposed by Sir David Brewster. The term
الصفحة 9 - I assume this force to act under portions of the earth's crust of considerable extent at any assignable depth, either with uniform intensity at every point, or in some cases, with a somewhat greater intensity at particular points, as, for instance, at points along the line of maximum elevation of an elevated range, or at other points where the actual phenomena seem to indicate a more than ordinary energy of this subterranean action. I suppose this elevatory force, whatever may be its origin, to act...
الصفحة 114 - Their evident analogy to the property of a triangle " that the sines of the angles are proportional to the opposite sides", has suggested another form under which they may be put.
الصفحة 55 - ... to the causes to which we have been assigning such phenomena, could not be produced by successive elevations of different points, by the partial action of an elevatory force.
الصفحة 400 - Very often too, when sound is reflected, these suppositions will lead to sensibly correct results. On this last account, the problem has here been considered generally for all fluids whether elastic or non-elastic in the usual acceptation of these terms; more especially, as thus its solution is not rendered more complicated. One result of our analysis is so simple that I may perhaps be allowed to mention it here. It is this : If A be the ratio of the density of the reflecting medium to the density...
الصفحة 73 - Holme, there is a bed extending for a great wayi surmounted by a parallel series of the secondary strata in contact with it ; but, on a narrow inspection, innumerable veins are seen branching into the strata in every possible direction, illustrating in a very perfect manner the origin of at least one order of veins. In a second case, three beds of trap can be traced in a parallel direction for a considerable space, separated by the regular strata, when suddenly the whole unite into one mass. Had...
الصفحة 461 - ... that joint : if it lie within the cone spoken of, the structure will not slip upon that joint ; if it lie without it, it will. Thus the whole theory of the equilibrium of any structure is involved in the determination with respect to that structure of these two lines — the line of resistance, and the line of pressure. One of these lines, the line of resistance, determining the point of application of the resultant of the pressures upon each of the surfaces of contact of the system ; and the...
الصفحة 126 - Given the sum or difference of two angles, and the ratio of their sines, to find the angles, This...