The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1866 |
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Altres edicions - Mostra-ho tot
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualització completa - 1904 |
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualització completa - 1894 |
The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science Visualització completa - 1901 |
Frases i termes més freqüents
absorption action actual energy æther ammonia amount animal aqueous vapour atmosphere axis bead body calculated Calculus of Variations carbonic acid cent centims chemical chloride coefficient coils colour Compounds condition containing curve deflection determined diameter didymium dry air earth effect electric equal experiments film fluorescence gases given glass grms gun-cotton heat hydrochloric acid hydrogen inches increase insoluble iodine iron liquid magnesia magnetic mercury metal method metre metrekilogs millims mineral moist air molecules motion muscular nitrate nitric acid nitrogenous nodes observed obtained oxide Oxide-film oxygen paper particles phenol Philosophical Magazine placed plane plate platinum polarization position produced Professor proportion quantity radiation rays reducing flame rock-salt rosolic acid rotation segments Siemens Siemens's soda solid soluble solution spectrum stannous chloride string substance sulphuric acid surface temperature thermopile thickness tion tube unit vibration vis viva weight wire
Passatges populars
Pàgina 160 - Guineas each, with every requisite to assist those commencing the study of this interesting science, a knowledge of which affords so much pleasure to the traveller in all parts of the world. * A collection for Five Guineas which will illustrate the recent works on Geology by Ansted, Buckland.
Pàgina 62 - ... did not hold good — namely, that "The sum of the mechanical effects produced in two individuals, in the same temperature, is proportional to the amount of nitrogen in their urine, whether the mechanical force has been employed in voluntary or involuntary motions, whether it has been consumed by the limbs or by the heart and other viscera " — unless, indeed, as has been assumed by some experimenters, there is, with increased nitrogen in the food, an increased amount of mechanical force employed...
Pàgina x - Lithology, or a Classified Synopsis of the Names of Rocks and Minerals, also by Mr. LAWRENCE, adapted to the above work, may be had, price 5s. or printed on one side only (interpaged blank) for use in Cabinets, price 7s. A TREATISE on ELECTRICITY, in Theory and Practice. By A. DE LA RIVE, Prof, in the Academy of Geneva.
Pàgina 56 - As an immediate effect of the manifestation of mechanical force, we see, that a part of the muscular substance loses its vital properties, its character of life ; that this portion separates from the living part, and loses its capacity of growth and its power of resistance. We find that this change of properties is accompanied by the entrance of a foreign body (oxygen) into the composition oi...
Pàgina 194 - It can scarcely be doubted, however, that the chief use of the nitrogenous constituents of food is for the renewal of muscular tissue ; the latter, like every other part of the body, requiring a continuous change of substance, whilst the chief function of the non-nitrogenous is to furnish by their oxidation the actual energy which is in part transmuted into muscular force. The combustible food and oxygen coexist in the blood which courses through the muscle, but when the muscle is at rest there is...
Pàgina 56 - ... and all experience proves, that this conversion of living muscular fibre into compounds destitute of vitality is accelerated or retarded according to the amount of force employed to produce motion. Nay, it may safely be affirmed, that they are mutually proportional ; that a rapid transformation of muscular fibre, or, as it may be called, a rapid change of matter...
Pàgina 56 - ... constituents of food, not only with the formation in the animal body of the compounds containing nitrogen, but also •with the development of muscular power, and, on the other, of the general relationship of the non-nitrogenous constituents of food with respiration, the development of heat, and the deposition of animal fat, he concluded that the relative value of different foods, as such, was to a great extent dependent on, and even measurable by, the proportion of nitrogenous constituents which...
Pàgina 75 - I now form a second string of silk of the same length, by laying four strands of the first side by side. I attach this compound thread to b, and keeping the tension the same as in the last experiment, set b in vibration. The compound thread synchronises with b, and swings as a whole. Now, by quadrupling the original thread, I obtained a string of twice the diameter of the original one : for the transverse section of any string is as the square of its diameter. Hence, as the fork b vibrates with half...
Pàgina 198 - Ib. of flour or pea-meal or of 3£lbs. of lean beef. Bonders, in his admirable pamphlet ' On the Constituents of Food and their Relation to Muscular Work and Animal Heat,' mentions the observations of Dr. MC Verloren on the food of insects. The latter remarks, " Many insects use during a period in which very...
Pàgina 74 - ... have now to revert to beauty of another kind. The experiments with tuning-forks above described, may be extended to the establishment of all the laws of -vibrating strings. I have here four forks, a, b, c, d, whose vibrations are in the proportion of the numbers 1, 2, 4, 8. Attaching a string eight feet long to the largest fork, I stretch it by a weight which causes it to vibrate as a whole. Keeping the stretching weight or tension the same, I attach pieces of the string to the other forks, and...