Proceedings of the American Association for the Advancement of Science, Bände 9-10 |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
A. D. BACHE acid Albany American ammonia angle anglesite appear Association axis azoic B. A. GOULD barometer BENJAMIN PEIRCE Boston Cambridge Cape carbonate Cincinnati co-tidal lines Coast Survey color computed Connecticut corresponding crystals curve declination determined direction distance effect English epoch equator error fact feet first-cousins formula Geology give gneiss Hatboro Haven heat horizontal inch increase intervals Island James John JOHN TORREY Joseph lake Lake Superior latitude Lawrence longitude LOUIS AGASSIZ Mass Massachusetts mean meeting miles mineral motion nearly observations obtained Ohio paper Permanent Secretary phenomena Philadelphia portion present probably produced Prof Professor Providence 9 retina right ascension rocks San Francisco sand sandstone Silurian sound specimens spots Standing Committee stations surface temperature tion values velocity vowel Washington wave William wind WOLCOTT GIBBS York
Beliebte Passagen
Seite 203 - WHITNEY. THE object of the present communication is to call attention to the geological position and mode of occurrence of one of the most interesting and important classes of the ores of iron, namely, those which are associated with rocks of the azoic system. The term Azoic, first...
Seite 66 - Each candidate is to send his exercise privately: each is to have some motto prefixed; and to be accompanied by a paper sealed up, with the same motto on the outside; which paper is to enclose another, folded up, having the candidate's name and college written within. The papers containing the names of those persons who do not succeed are destroyed unopened.
Seite xi - The objects of the Association are, by periodical and migratory meetings, to promote intercourse between those who are cultivating science in different parts of the United States; to give a stronger and more general impulse and a more systematic direction to scientific research in our country; and to procure for the labors of scientific men increased facilities and a wider usefulness.
Seite 101 - ... centre of the cube, and their bases against the steel plates. In the case where rigid equable pressure is employed, as in that of the thick steel plate, all parts must give way together. But in that of a yielding equable pressure, as in the case of interposed lead, the stone first gives way along the lines of least resistance, and the remaining pressure must be sustained by the central portions around the vertical axis of the cube.
Seite 66 - PRIZE," be awarded every two years to the author of the best Essay on some subject of Pure Mathematics, Astronomy, or other branch of Natural Philosophy. 2. That the...
Seite 115 - The Greek architect was untrammelled by any condition of utility. Architecture was with him in reality a fine art. The temple was formed to gratify the tutelar deity. Its minutest parts were exquisitely finished, since nothing but perfection on all sides and in the smallest particulars could satisfy an all-seeing and critical eye. It was intended for external worship, and not for internal use. It was without windows, entirely open to the sky, or if closed with a roof, the light was merely admitted...
Seite 211 - ... least. Whenever a garnet or a lump of quartz was imbedded in compact feldspar, and favorably presented to the action of the sand, the feldspar was cut away around the hard mineral, which was thus left standing in relief above the general surface.
Seite 211 - however, of the feldspar, on the lee side of the garnets, being protected from the action of the sand by the superior hardness of the gem, also stood out in relief, forming an elevated string, osar-like, under their lee. When the surface acted on, was vertical and charged with garnets, a very peculiar result was produced ; the garnets were left standing in relief, mounted on the end of a long pedicle of feldspar, which had been protected from action while the surrounding parts were cut away. These...
Seite 97 - Though the art of building has been practised from the earliest times, and constant demands have been made, in every age, for the means of determining the best materials, yet the process of ascertaining the strength and durability of stone appears to have received but little definite scientific attention, and the commission, who...
Seite 186 - There is no marked difference in the general character of the veinstones of the several mineral lodes, nor any features to distinguish as a class those of the red shale from those of the gneiss.