A Manual of Applied MechanicsGriffin, 1864 - 648 من الصفحات |
المحتوى
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
angle angle of repose angular momentum angular velocity applied Article axes bars beam body catenary centre of gravity centre of resistance co-efficient co-ordinates components conjugate pressure cord cos² couple curvature curve denote depth deviation diagonal diameter direction distance ellipse equal and opposite equation equilibrium exerted expressed extrados figure fluid formula friction girder given horizontal inclined inertia intensity intrados joint length line of action linear arch moment of inertia motion neutral axis normal oblique P₁ P₂ pair parabola parallel forces parallel projection perpendicular polygon position principal stresses principles prism proportional radius radius of curvature ratio rectangular relatively represent respectively resultant rotation shearing shearing stress sin² solid spandril specific gravity stability straight line structure surface tangential tension THEOREM thrust tion traversing truss uniform vertical ordinate weight wheel Λ Λ Λ
مقاطع مشهورة
الصفحة 490 - ... of those parts into the square of the distance of its centre of gravity from the axis, adding the products together, and finding the value towards which their sum converges when the size of the small parts is indefinitely diminished.
الصفحة 3 - ... which he finds in treatises on dynamics, and should make no allowance for the imperfection of his materials, his whole apparatus of beams, wheels, and ropes would soon come down in ruin, and, with all his geometrical skill, he Would be found a far inferior builder to those painted barbarians who, though they never heard of the parallelogram of forces, managed to pile up Stonehenge.
الصفحة 3 - If the engineer, who has to lift a great mass of real granite by the instrumentality of real timber and real hemp, should absolutely rely on the propositions which he finds in treatises on Dynamics, and should make no allowance for the imperfection of his materials, his whole apparatus of beams, wheels, and ropes would soon come down in ruin...
الصفحة xv - ... complete and most mischievous development amongst the mediaeval schoolmen, and the remains of whose influence can be traced even at the present day — the fallacy of a double system of natural laws...
الصفحة 54 - ... constant. Let x,, y,, z, be the co-ordinates of the centre of gravity of a flat plate having its middle plane coincident with the given cross-section.
الصفحة 13 - Force is an action between two bodies, either causing or tending to cause change in their relative rest or motion.
الصفحة 5 - Another evil, and one of the worst which arises from the separation of theoretical and practical knowledge, is the fact that a large number of persons, possessed of an inventive turn of mind and of considerable skill in the manual operations of practical mechanics, are destitute of that knowledge of scientific principles which is requisite to prevent their being misled by their own ingenuity. Such men too often spend their money, waste their lives, and it may be lose their reason, in the vain pursuit...
الصفحة 193 - Friction is that force which acts between two bodies at their surface of contact so as to resist their sliding on each other, and which depends on the force with which the bodies are pressed together.
الصفحة 19 - The Arm of a couple is the perpendicular distance between the lines of action of the two forces...
الصفحة 203 - ... ordinary mortar sometimes attains in the course of years a tenacity equal to that of limestone, yet, when fresh, its tenacity is too small to be relied on in practice as a means of resisting tension at the joints of the structure ; so that a structure of masonry or brickwork, requiring, as it does, to possess stability while the mortar is fresh, ought to be designed on the supposition, that the joints have no appreciable tenacity.