ما يقوله الناس - كتابة مراجعة
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acre Airolo amount applied arch balance spring body boiler bridge cable carbon cast cast iron cement cent center of gravity chemical compression construction cubic cubic foot curve cylinder deflection diameter direction distance dome Downward Filtration earth effect effluent elastic engine equal equation experiments explosion fact feet force formula friction furnace girder Goschenen heat horizontal impact increase irrigation land length less load magnetic manufacture mass material matter maximum means ment Merthyr metal meters method momentum motion nitroglycerin Nostrand observations obtained ordinary parabola pig metal plane position pounds practical pressure produced proportion puddling furnace quantity resistance river rope sewage specific gravity square inch steam steel strain strand strength surface surface condenser temperature tensile strength tension thickness tion tons torpedo tunnel unit velocity vertical vis viva viva weight wire wrought iron
الصفحة 332 - Our doubts are traitors, And make us lose the good we oft might win, By fearing to attempt.
الصفحة 423 - I derive from the celestial phenomena the forces of gravity with which bodies tend to the sun and the several planets. Then from these forces, by other propositions which are also mathematical, I deduce the motions of the planets, the comets, the moon, and the sea.
الصفحة 328 - Even so. Life is short, art long. Yet the short yields the long, and but for the short the long could not be. It is out of these littlenesses of human effort that the greatnesses follow. Or, as Benjamin Rush very forcibly puts it, and simply as forcibly : " There are mites in science as well as in charity, and the ultimate results of each are often alike important and beneficial." It is my fortune, good or bad, to have to preside over the council of this new society. Of the ability of those who form...
الصفحة 422 - I offer this work as the mathematical principles of philosophy, for the whole burden of philosophy seems to consist in this — from the phenomena of motions to investigate the forces of nature, and then from these forces to demonstrate the other phenomena; and to this end the general propositions in the first and second Books are directed.
الصفحة 423 - For instance, if two globes, kept at a given distance one from the other by means of a cord that connects them, were revolved about their common centre of gravity, we might, from the tension of the cord, discover the endeavour of the globes to recede from the axis of their motion, and from thence we might compute the quantity of their circular motions.
الصفحة 288 - He has worked out the requirements, starting with the proposition that the total gravitation of the earth as measured on its normal surface is composed of the separate attractions of all its parts, and that the attractive influence of each equal volume varies directly as its density and inversely as the square of its distance from the point of measurement. The density of sea water being about...
الصفحة 80 - That all compounds of iron with its ordinary ingredients which have been cast from a fluid state into malleable masses, and which will not sensibly harden by being quenched in water while at a red heat, shall be called ingot iron.
الصفحة 339 - ... to fall. Health in the home is health everywhere. Elsewhere it has no abiding place. I have been brought indeed by experience to the conclusion that the whole future progress of the sanitary movement rests for permanent and executive support on the women of the country.
الصفحة 288 - of the peculiarities of this mechanical arrangement is that it is parathermal, the diminishing elastic force of the springs with rise of temperature being compensated by a similar decrease of potential of the mercury column, which decrease depends upon the proportions given to the areas of the steel tube and its cup-like extensions.