Proceedings of the American Academy of Arts and Sciences, Volum 56Metcalf and Company, 1921 Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell. |
Altres edicions - Mostra-ho tot
Proceedings of the American Academy of Arts and Sciences, Volum 42 American Academy of Arts and Sciences Visualització completa - 1907 |
Proceedings of the American Academy of Arts and Sciences, Volum 43 American Academy of Arts and Sciences Visualització completa - 1908 |
Proceedings of the American Academy of Arts and Sciences, Volum 41 American Academy of Arts and Sciences Visualització completa - 1906 |
Frases i termes més freqüents
absohms Academy acoustic conductor acoustic impedance amalgam Amer Anaximander Anaximander's Apollodorus Arthur atmospheric pressure axes bismuth Boston burchelli calomel electrode Cambridge Cambridge capillary cell chap Charles Cheliomyrmex Chem Class coefficient of resistance Committee constant coplanar decreases diameter diaphragm difference Dorylus dynes per kine Eciton effect electric equation Eratosthenes Fellow Figure geodesic curvature geographical ghosts glass Hecataeus hyperboreus hyperosculating impressed frequency iodine Labidus larvæ length lens linear liquid lithium male maximum measurements mechanic impedance Meeting melting curve mercury metals Milesian motional impedance normal Nujol observed ocular ohms plankton plug potassium potential pressure coefficient properties quadratic vector reactance regarding researches sample saturated Section sodium solid solution specific resistance specimen Strabo Suidas surface telephone receiver temperature coefficient thallium thallium electrode thallous chloride thallous iodide THEOREM thermal tion total mechanic impedance trajectories treatise tube velocity William wire workers zero
Passatges populars
Pàgina 256 - Of the earlier period, in which Miletus ran its feverish course of unexampled activity, there are no written records extant : like the good mother she was, she lived on in her almost countless children, the colonies she had planted. Among the last of these was Apollonia, which Anaximander served as founder. Thales seems to have lived to an advanced age and to have died about the same time as Anaximander. There is every indication that Simplicius added the reference to the poetic style. See Strabo...
Pàgina 435 - ... to the author of any important discovery or useful improvement in light or in heat, which shall have been made and published by printing, or in any way made known to the public, in any part of the continent of America, or any of the American islands ; preference being always given to such discoveries as shall, in the opinion of the Academy, tend most to promote the good of mankind...
Pàgina 143 - Thus the change in the ratio of the resistance of liquid to solid potassium was from 1.56 to 1.55 under a pressure increase of 9700 kg. This pressure is sufficient to decrease the difference of volume between liquid and solid to 0.31 of its initial value. It seems to be universally true that the temperature coefficient of the liquid is less than that of the solid, and the change of resistance on melting is in the direction of the change of volume. Theoretical Implications. — The following remarks...
Pàgina 292 - A constant stream of workers from the nest brought hundreds more larvae, and no sooner had they been planted and debris of sorts sifted over them, than they began spinning. A few had already swathed themselves in cocoons — exceedingly thin coverings of pinkish silk. As this took place out of the nest, in the jungle, they must be covered with wood and leaves. The vital necessity...
Pàgina 240 - C. 7. signifies is perhaps not quite so clear. Let us consider it somewhat more at length. This passage bears out the conclusion we reached above in regard to the list of geographers drawn up by Eratosthenes. It was not for their supposed connection with philosophy, but solely as geographers that he mentioned Anaximander and Hecataeus, and Homer was not entered in the roll of honor. As regards the contribution of these pioneers of the science it hardly needs to be said that the testimony of so great...
Pàgina 347 - Allegheny, for his application of the spectroscope to astronomical problems, and especially for his investigations of the proper motions of the nebulte, and the physical constitution of the rings of the planet Saturn, by the use of that instrument.
Pàgina 163 - In order that a triply infinite system of curses ( cc ' in each direction through each point) on a surface may be identified with a system of dynamical trajectories under any positional field of force, -the given system must possess properties I, II, III, IV, V. When the surface is a developable surface, the bicircular quartic of property I reduces to a circle passing through the given point. If the field of force is conservative, the conic of property III reduces to a rectangular hyperbola. 3. If...
Pàgina 136 - ... liquid to that of the solid at the freezing point at 0° and 7640 kg. is 3.345. that the values for the solid and the liquid are so close, and still more surprising that the value for the solid is greater than that for the liquid. The former rough work suggested the opposite and more natural behavior. The ratio of the resistance of the solid to that of the liquid at the freezing pressure may also be calculated from the measurements. In view of the extreme care taken to compel the freezing to...
Pàgina 281 - I have been able to devote comparatively little study, is rather summary, but every attempt to attain 1 Contributions from the Entomological Laboratory of the Bussey Institution, Harvard University. No.
Pàgina 137 - gives 3.8 as the mean of six determinations, all for the ratio at the freezing point at atmospheric pressure. The error is so large that it is not possible to say more than that the change in the ratio along the melting curve is not large, and is in the direction of a decrease with increasing pressure. The change is probably greater than the change in the difference of volume between solid and liquid, which is abnormally constant for mercury, there being a decrease in the difference of only 1% over...