Lectures on Some Recent Advances in Physical Science, with a Special Lecture on ForceMacmillan and Company, 1885 - 368 páginas |
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Términos y frases comunes
absolutely absorbing absorption amount of heat Ångström applied atmosphere Balfour Stewart battery black body body boiler bright lines calculate called carbonic acid Carnot's coal gas colder colour compress conducting power conservation of energy copper course current electricity cylinder dark lines definite direction earth earth's atmosphere electricity enormous equal equivalent experiment experimental fact force friction gases give given hydrogen incandescent inch instance Joule kind kinetic energy light liquid magnet mass mathematical matter Mayer melting metal moving Newton's Newton's Third Law ordinary particles pass perfect engine perfectly perpetual motion physical piston portion potential energy precisely pressure produced quantity of heat radiant heat radiation reasoning result rotation Séguin side simply solar spectrum solid stars steam substance sun's sunlight suppose surface temperature thing tion transformation tricity vapour velocity vessel vibration whole wire zinc
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Página 43 - It is hardly necessary to add, that anything which any insulated body, or system of bodies, can continue to furnish without limitation, cannot possibly be a material substance ; and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything capable of being excited and communicated in the manner the Heat was excited and communicated in these experiments, except it be MOTION.
Página 356 - Change of motion is proportional to the impressed force, and takes place in the direction of the straight line in which the force acts.
Página 360 - To every action there is always an equal and contrary reaction ; or the mutual actions of any two bodies are always equal and oppositely directed.
Página 34 - The area of a section which lies between the centroid of the tensile reinforcement and the compression face of the flexural member. Effective area of reinforcement — The area obtained by multiplying the right cross-sectional area of the reinforcement by the cosine of the angle between its direction and the direction for which the effectiveness is to be determined.
Página 47 - The immediate cause of the phenomena of heat then is motion, and the laws of its communication are precisely the same, as the laws of the communication of motion.
Página 39 - It frequently happens, that in the ordinary affairs and occupations of life, opportunities present themselves of contemplating some of the most curious operations of Nature ; and very interesting philosophical experiments might often be made, almost without trouble or expense, by means of machinery contrived for the mere mechanical purposes of the arts and manufactures.
Página 168 - ... the centre, and the earth is even now losing heat at a perfectly measurable rate ; therefore it is possible to calculate what was the distribution of heat a hundred thousand or a thousand thousand years ago, supposing the present natural laws to have been then in existence. According to these data, about ten millions of years ago the surface of the earth had just consolidated, or was just about to consolidate...
Página 43 - BOILED! It would be difficult to describe the surprise and astonishment expressed in the countenances of the by-standers, on seeing so large a quantity of cold water heated, and actually made to boil, without any fire.
Página 26 - I have endeavoured to infer, those of chemistry and molecular attractions, or as the laws of chemical affinity in their turn transcend those of mere mechanics. Science can be expected to do but little to aid us here, since the instrument of research is itself the object of investigation. It can but enlighten us as to the depths of our ignorance, and lead us to look to a higher aid for that which most nearly concerns our well-being.
Página 288 - Nothing is more preposterously unscientific than to assert (as is constantly done by the quasi-scientific writers of the present day) that with the utmost strides attempted by science we should necessarily be sensibly nearer to a conception of the ultimate nature of matter.