The Scientific Proceedings of the Royal Dublin Society, Volume 9Royal Dublin Society, 1902 |
Contents
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absorbent absorption alcohol alkaline ammonia amount of atmospheric anatase anhydrous apparatus appears Assay Plan atmospheric carbonic anhydride augite baryta baryta solution baryta water Biedermann's Centrbl Blank experiment required bottle c.cs carbonic acid Cassiterite cent Chem chemical clock CO₂ colour Compt containing crystals cubic centimetres dilute Dissolved oxygen distance distilled water Duplicate employed error feet felspar gases glass glucoside grams granite ground air H₂O heat Hofmann's Jahresber hydrate hydrochloric acid hyphae indicated Journ Kohlensäuregehalt latter light liquid litre mean measuring melting point method metres mineral mixture molecular molecules Müntz nitrogen observed obtained occur ordinary orthoclase oxide Oxygen determination required paper Pettenkofer's pipette Plate potash Proc quantity quartz Received for Publication reef rhizome river rock Royal Dublin Society salt sample schists silica sodium soluble stop-cock substance sulphate supersaturated surface temperature thickness tion titrated tube valley vessel volume Wollny's Forsch Zeitschr
Popular passages
Page 589 - BY GRENVILLE AJ COLE, MRIA, FGS, Professor of Geology in the Royal College of Science for Ireland, and Examiner in the University of London.
Page 79 - Nature, whether those carried on upon a large or on a small scale. (See fig. 1). At the suggestion of some scientific friends he now publishes the diagram, in the hope that it may prove of equal assistance to others, by contributing towards the formation of a correct estimate of what that little is which man can truly know ; and of the contrast which necessarily prevails whenever the boundless range both in time and space of each actual operation in nature, is considered in its relation to the limits...
Page 94 - Born in such a year; died in such another," while the real event, the intervening life, is passed over in silence. How, then, ought the student of Molecular Physics to regard the incidents of the eventful period of a chemical * The magnification of molecular intervals by a uno-ten may be called standard magnification of molecular events ; because it means the representing of molecular events which require to be recorded in Group D by a model of them so large that it records them in the...
Page 82 - ... of chemical atoms in each cubic millimetre of solids and liquids — not exactly that number, but somewhere near it. He thus arrived at an estimate — an estimate, not a determination — as to the number of molecules in a gas, and as to the number of chemical atoms in solids and liquids. Such knowledge is imperfect, but is much better than knowing nothing about the scale on which Nature is working in this branch of her operations. The general results of the information acquired in 1860 were...
Page 85 - The survey may be rendered definite with the help of the table comprised in fig. 6, in which numerical digits are to take the place of some of the ciphers. According to the place where we insert these numbers we can make them express by how many metres, or by what fraction of a metre, we are to measure any of the magnitudes with which man has become acquainted throughout the whole range of his study of Nature. In this table metres mean decimal multiples of the metre ; metrets mean its decimal sub-multiples...
Page 397 - Centesimalgrade ändern kann. Hält man nun die schon nicht weniger als 400 bis 500 Atmosphären betragende Pressung, welche ungefähr zur Sprengung der 3 Millimeter dicken Wandung einer 2 Millimeter weiten Glasröhre erfordert wird, mit jener gewaltigen Druckkraft zusammen, welche die Feste ganzer Continente erschüttert oder emporhebt, und sich in meilenlangen...
Page 583 - On the Possibility of Originating "Wave Disturbances in the Ether by Means of Electric Forces.
Page 84 - ... the number which is a thousand times larger. The knowledge thus reached as to the number of molecules that are present may seem very indefinite ; but it is far from being valueless. succeed in measuring are the distances of those few stars which have perceptible...
Page 87 - ... wave-length. This is truly astonishing, when we remember that we are here measuring lengths that are from 100,000 to 1,000,000 times smaller than the most minute interval that can be detected by the microscope — as much smaller than a micron as a tenth or hundredth of an inch is less than three-quarters of a mile. Nevertheless these lengths can be determined with precision because the position of a line in the spectrum depends on its wave-length, and the difference of the wave-lengths of the...
Page 94 - ... perceive that chemical reactions, even those that occur with explosive violence, are far from being the sudden events they seem to ordinary human apprehension. What is really occurring in nature is a protracted and eventful struggle between the members of two opposing armies, each individual of which has his own personal history during the struggle, and is fully occupied with his own acts, which are, perhaps, as many, as various, and as different from those of his neighbours as are the thoughts...