Popular Lectures on Scientific SubjectsD. Appleton, 1897 - 397 páginas |
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Términos y frases comunes
action appear become blue bodies bright carbonic acid changes cochlea Col du Géant colour combination combustion compound compressed conception corresponding depends direct effect electrical excited experiments fact fall fibres field of vision follows form of wave fundamental tone glacier Goethe Hence human human voice impression instrument investigation Joule kind labour layers Lectures light machine mass means mechanical force melt Mer de Glace moving musical natural forces névé observation octave optic nerve peculiar perception perpetual motion phenomena physical physiology piano pieces of ice pitch possible present pressure produced quantity of heat rays recognise relations result retina scientific seen sensations sensations of sight senses separate side sight simple tones simple waves snow space stereoscopic string surface sympathetic vibration temperature theory theory of colour tion upper partial tones velocity vibration vis viva waves of sound weight
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Página 130 - And God said, Let there be light: and there was light. And God saw the light, that it was good: and God divided the light from the darkness. And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Página 307 - THE PRINCIPLES OF MENTAL PHYSIOLOGY. With their Applications to the Training and Discipline of the Mind, and the Study of its Morbid Conditions.
Página 97 - ... from the size of a pin's head to that of a pea ; scattered through a large body of sand or clay ; and in this state it is called by the Mandingoes sanoo munko,
Página 122 - In the mean time there is little prospect of the law being proved incorrect. At all events, we must admire the sagacity of Thomson, who, in the letters of a long-known little mathematical formula, which only speaks of the heat, volume, and pressure of bodies, was able to discern consequences which threatened the universe, though certainly after an infinite period of time, with eternal death.
Página 108 - The nature of the problem was quite calculated to entice poring brains, to lead them round a circle for years, deceiving ever with new expectations, which vanished upon nearer approach, and finally reducing these dupes of hope to open insanity. The phantom could not be grasped. It would be impossible to give a history of these efforts, as the clearer heads, among whom the elder Droz must be ranked, convinced themselves of the futility of their experiments, and were naturally not inclined to speak...
Página 132 - ... of necessity cease. Similar currents are produced by the same cause in the waters of the sea. Their power may be inferred from the influence which in some cases they exert upon climate. By them the warm /"*"~ water of the Antilles is carried to the British Isles, and...
Página 106 - The writing-boy of the elder Droz was publicly exhibited in Germany some years ago. Its wheelwork is so complicated, that no ordinary head would be sufficient to decipher its manner of action. When, however, we are informed that this boy and its constructor, being suspected of the black art, lay for a time in the Spanish Inquisition, and with difficulty obtained their freedom, we may infer that in those days even such a toy appeared great enough to excite doubts as to its natural origin. And though...
Página 114 - A particular constituent of our atmosphere, oxygen, possesses a strong force of attraction, or, as it is named in chemistry, a strong affinity for the constituents of the combustible body, which affinity, however, in most cases, can only exert itself at high temperatures. As soon as a portion of the combustible body, for example, the coal, is sufficiently heated, the carbon unites itself with great violence to the oxygen of the atmosphere and forms a peculiar gas, carbonic acid, the same which we...
Página 307 - MESMERISM, AND THE NEW WITCHCRAFT. By ERNEST HART, formerly Surgeon to the West London Hospital, and Ophthalmic Surgeon to St. Mary's Hospital, London. New edition, enlarged and revised. With new chapters on "The Eternal Gullible" and
Página 119 - ... law correspond to this more general significance. It is in the first place clear, that the work which, by any natural process whatever, is performed under favourable conditions by a machine, and which may be measured in the way already indicated, may be used as a measure of force common to all. Further, the important question arises, If the quantity of force cannot be augmented except by corresponding consumption, can it be diminished or lost? For the purposes of our machines it certainly can,...