Treatise on Natural Philosophy, Volume 1 |
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Page xviii
... Normal Section , and Rotations , due to Flexure and Torsion , Potential Energy of Bent and Twisted Wire - Components of Restituent Couple - Principal Torsion - flexure Axes and Rigidities - Three Principal Spirals , SECTIONS 553-560 561 ...
... Normal Section , and Rotations , due to Flexure and Torsion , Potential Energy of Bent and Twisted Wire - Components of Restituent Couple - Principal Torsion - flexure Axes and Rigidities - Three Principal Spirals , SECTIONS 553-560 561 ...
Page xix
... Normal Section - Axes of Bending Stress - Definitions of Synclastic and Anticlastic Stress - Resolution and Composition of Stresses and Curvatures , . Work done in Bending Plate - Partial Differential Equa- tions of Work done ...
... Normal Section - Axes of Bending Stress - Definitions of Synclastic and Anticlastic Stress - Resolution and Composition of Stresses and Curvatures , . Work done in Bending Plate - Partial Differential Equa- tions of Work done ...
Page 10
... normal to the curve PQ . And thus the evolute of PQ is a definite curve , viz , the envelope of the normals drawn at every point of PQ , or . which is the same thing , the locus of the centres of curvature of the curve PQ . And we may ...
... normal to the curve PQ . And thus the evolute of PQ is a definite curve , viz , the envelope of the normals drawn at every point of PQ , or . which is the same thing , the locus of the centres of curvature of the curve PQ . And we may ...
Page 75
... normal at the point of contact . This is pure spinning , and does not change the point of contact . Let it move , so that the instantaneous axis , still passing through the point of contact , is neither in , nor perpendicular to , the ...
... normal at the point of contact . This is pure spinning , and does not change the point of contact . Let it move , so that the instantaneous axis , still passing through the point of contact , is neither in , nor perpendicular to , the ...
Page 78
... normal plane to the surface ; and therefore at starting the given curve must be Two degrees so applied to its trace on the surface that the projections of the two curves on the tangent plane may be of equal curvature . of freedom . The ...
... normal plane to the surface ; and therefore at starting the given curve must be Two degrees so applied to its trace on the surface that the projections of the two curves on the tangent plane may be of equal curvature . of freedom . The ...
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Common terms and phrases
action amount angular velocity anticlastic attraction axes axis centre of inertia circle circular co-ordinates coefficients components condition cone configuration constant couple curvature curve cylinder denote density differential direction displacement distance distribution ds ds dx dy dz dy dx dy dy edge elements ellipsoid equal equations equilibrium expression external point finite fixed flexural rigidity flexure fluid formulæ function given gravity harmonic Hence homogeneous impulse infinitely small integral isotropic kinetic energy longitudinal mass matter measure moment of inertia motion moving normal section osculating plane parallel particle perpendicular plate portion position potential energy principle prism problem produce quantity radius reckoned rectangular resultant rigid body rotation round shear shell sides simple simple harmonic motion solid angle solution space sphere spherical harmonic spherical surface strain stress substance suppose synclastic tangent plane theorem tion torsion traction twist uniform values whole wire
Popular passages
Page vi - We believe that the mathematical reader will especially profit by a perusal of the large type portion of this Volume, as he will thus be forced to think out for himself what he has been too often accustomed to reach by a mere mechanical application of analysis. Nothing can be more fatal to progress than a too confident reliance upon mathematical symbols ; for the student is only too apt to take the easier course, and consider the formula and not the fact as the physical reality.
Page 269 - When, in an experiment, all known causes being allowed for, there remain certain unexplained effects (excessively slight it may be), these must be carefully investigated, and every conceivable variation of arrangement of apparatus, etc., tried ; until, if possible, we manage so to exaggerate the residual phenomenon as to be able to detect its cause. It is here, perhaps, that in the present state of science we may most reasonably look for extensions of our knowledge ; at all events we are warranted...
Page 269 - In all cases when a particular agent or cause is to be studied, experiments should be arranged in such a way as to lead if possible to results depending on it alone ; or, if this cannot be done, they should be arranged so as to increase the effects due to the cause to be studied till these so far exceed the unavoidable concomitants, that the latter may be considered as only disturbing, not essentially modifying the effects of the principal agent.
Page 172 - Work done on any system of bodies (in Newton's statement, the parts of any machine) has its equivalent in work done against friction, molecular forces, or gravity, if there be no acceleration ; but if there be acceleration, part of the work is expended in overcoming the resistance- to acceleration, and the additional kinetic energy developed is equivalent to the work so spent.
Page 302 - ... surface at the part where the cone is cut by it. A very small cone is said to be cut obliquely, when the section is inclined at any finite angle to an orthogonal section ; and this angle of inclination is called the obliquity of the section. The area of an orthogonal section of a very small cone is equal to the area of an oblique section in the same position, multiplied by the cosine of the obliquity.
Page 22 - Def. When a point Q moves uniformly in a circle, the perpendicular QP drawn from its position at any instant to a fixed diameter AA' of the circle, intersects the diameter in a point P, whose position changes by a simple harmonic -motion. Thus, if a planet or satellite, or one of the constituents of a double star...
Page 145 - We cannot, of course, give a definition of matter which will satisfy the metaphysician, but the naturalist may be content to know matter as that which can be perceived by the senses, or as that which can be acted upon by, or can exert, force.
Page 148 - Matter has an innate power of resisting external influences, so that every body, as far as it can, remains at rest or moves uniformly in a straight line.
Page 292 - Farther approximn rigid (ie, incapable of changing their form or dimensions), and the infinite series of forces, really acting, may be left out of consideration ; so that the mathematical investigation deals with a finite (and generally small) number of forces instead of a practically infinite number.
Page 269 - In general the actions which we see ever taking place around us are complex, or due to the simultaneous action of many causes. When, as in astronomy, we endeavour to ascertain these causes by simply watching their effects, we observe; when, as in our laboratories, we interfere arbitrarily with the causes or circumstances of a phenomenon, we are said to experiment.