Proceedings of the American Association for the Advancement of Science, Volum 9 |
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acid Albany American ammonia angle anglesite appear Association axis azoic beds BENJAMIN PEIRCE body Boston carbonate Carboniferous chlorine co-efficients co-tidal hour co-tidal lines Coast Survey color Committee compounds containing copper corresponding Cretaceous crystals curve declination Devonian direction distance earth effect epoch equator equivalent of hydrogen ethyl fact feet first-cousins formula galena Geology gneiss granite Hatboro heat hematite hydrogen inch investigation iron lake Lake Superior latitude Lawrence lead longitude magnetic declination masses mean meeting miles mineral motion mountain nearly observations obtained occurred Ohio organic oscillations Owego oxide oxygen paper Permanent Secretary phenomena Philadelphia portion present produced Prof Professor Providence pyrites pyromorphite quartz radicals region remarkable retina right ascension River rocks San Diego San Francisco sand sandstone Silurian Simoda species specimens spots stations storm strata surface temperature Tertiary tion velocity volume Washington waves York
Passatges populars
Pàgina xv - The objects of the Association are, by periodical and migratory meetings, to promote intercourse between those who are cultivating science In different parts of America, to give a stronger and more general impulse and more systematic direction to scientific research, and to procure for the labors of scientific men increased facilities and a wider usefulness.
Pàgina 70 - 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.
Pàgina 177 - In my reply to this letter Macomber's well was mentioned, and certain observations and experiments suggested, which it was thought might tend towards the solution of the problem. In the second letter of Mr. Corning, he writes as follows : — " The deep well spoken of by Macomber is situated at some distance west of the village proper, about a quarter of a mile from Owego Creek, and is on rather high ground ; but no hills or mountains of any height are in its vicinity. The water of this well in the...
Pàgina 69 - 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...
Pàgina 217 - ... 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.
Pàgina 107 - ... lines of least resistance, and the remaining pressure must be sustained by the central portions around the vertical axis of the cube. After this important fact was clearly determined, lead and all other interposed substances were discarded, and a method devised by which the upper and lower surfaces of the cube could be ground into perfect parallelism. This consists in the use of a rectangular...
Pàgina 217 - 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...
Pàgina 103 - 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...
Pàgina 192 - 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.
Pàgina 107 - ... pressure it would sustain without such an interposition. For example, one of the cubes precisely similar to another, which withstood a pressure of upwards of 60,000 pounds when placed in immediate contact with the steel plates, gave way at about 30,000 with lead interposed.