Science, المجلد 5John Michels (Journalist) American Association for the Advancement of Science, 1885 Since Jan. 1901 the official proceedings and most of the papers of the American Association for the Advancement of Science have been included in Science. |
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مقاطع مشهورة
الصفحة 74 - THE PREVENTABLE CAUSES OF DISEASE, INJURY, AND DEATH IN AMERICAN MANUFACTORIES AND WORKSHOPS, AND THE BEST MEANS AND APPLIANCES FOR PREVENTING AND AVOIDING THEM.
الصفحة 264 - See also the report of 1884 of a royal commission "to inquire into the instruction of the industrial classes of certain foreign countries in technical and other subjects, for the purpose of comparison with that of the corresponding classes in this country; and into the influence of such instruction on manufacturing and other industries at home and abroad.
الصفحة 50 - The members of the House so appointed shall serve for the term of two years; and on every alternate fourth Wednesday of December a like number shall be appointed in the same manner, to serve until the fourth Wednesday in December, in the second year succeeding their appointment.
الصفحة 50 - Institution, to be composed of the Vice-President, the Chief Justice of the United States, and three members of the Senate and three members of the House of Representatives...
الصفحة 422 - A (in the deepest red), or from near 40 (the ray of forty one hundredth thousandths of a millimetre in wave-length) to near 80. All below 80, to the right, is the invisible infra-red spectrum. Now, the shaded curve above the spectrum represents the amount of energy in the sun's rays at the foot of the mountain, and was obtained in this way : — Fix your attention for a moment on any single part of the spectrum, for instance, that whose wave-length is 60. If the heat in this ray, as represented by...
الصفحة 421 - ... three weeks in almost intolerable heat, the instruments having to be constantly swept clear of the red desert dust which the hot wind brought. Close by these tents a thermometer covered by a single sheet of glass, and surrounded by wool, rose to 237° in the sun, and sometimes in the tent, which was darkened for the study of separate rays, the heat was absolutely beyond human endurance. Finally, our apparatus was taken apart and packed in small pieces on the backs of mules, who were to carry...
الصفحة 49 - The several bureaus engaged in research should be left free to prosecute such research in all its details without dictation from superior authority in respect to the methods of research to be used. I beg to call the attention of the Commission to certain statements of the Committee of the National Academy of Sciences, which constitute a part of the record of the proceedings of this Commission. These statements are as follows : DEPARTMENT OF SCIENCE.
الصفحة 421 - Radiation here is increased by the absence of water vapour too, and on the whole this intimate personal experience fell in almost too well with our anticipations that the air is an even more elaborate trap to catch the sunbeams than had been surmised, and that this effect of selective absorption and radiation was intimately connected with that change of the primal energies and primal colour of the sun which we had climbed towards it to study.
الصفحة 232 - ... the light, but also through the portion which is underneath and not affected thereby, and which therefore detracts from the actual effect of the light upon the selenium at the surface. My form of cell is a radical departure from all previous methods of employing selenium, in all of these respects. In the first place, I form the selenium in very thin plates, and polarize them, so that the opposite faces have different electrical states or properties. This I do by melting it upon a plate of metal...
الصفحة 44 - Hydrographic office attached to the Bureau of Navigation in the Navy Department, for the improvement of the means for navigating safely the vessels of the Navy and of the...