Proceedings of the American Academy of Arts and Sciences, Volume 21

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Metcalf and Company, 1886
Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell.

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Page 539 - University, with a Reprint of the Catalogues of 1674, 1682, and 1700, 8vo, 1865, pp. 67. This little book is full of materials interesting to antiquaries and to graduates of the College. 3. Biographical Sketches of Graduates of Harvard College, 8vo, Vol. I., 1873, pp. 618 ; Vol. II., 1881, pp. 557 ; Vol. III., 1885, pp.
Page 498 - ... in our own sun and in other suns among the fixed stars, and the most probable theory seems to be that these masses were thrown off from such a sun, and that they very slowly cooled, while revolving in a zone of intense heat In this paper we have not taken into consideration a number of iron masses, whose meteoric origin has been generally accepted, which show no Widmanstattian figures and not even any Neumann lines. A considerable proportion of these are certainly not meteoric. In the Harvard...
Page 541 - A Catalogue of Plants growing without cultivation within thirty miles of Amherst College," which he published in the year 1875, the late Mr.
Page 448 - ... lines long; stipules usually equalling the petiole, 1 to 3 lines long : flowers few, iu short close racemes ; bracts very broadly ovate and concave, abruptly acuminate : calyx 4 lines long, nearly equalling the petals, the long-acuminate lobes exceeding the tube. — Collected by J. Reverchon in 1877 on rocky prairies in Hood and Johnson Counties, western Texas, and distributed in Curtiss's sets as P.
Page 267 - It will be seen from the above statement, that in 1870, several years before the telephones now in use were invented, a receiver was devised, constructed, and tried, which consisted of a flexible iron diaphragm, supported at the edges and replacing the armature of an electro-magnet.
Page 543 - ... which often enables the systematist to divine much further than he can perceive in the tracing of relationships. Upon this, in direct reference to Fries, and with a use of the term that seems to correlate it with " insight," Tuckerman remarks : " So great is the value of Habit in minds fully qualified to apprehend and appreciate its subtleties, that such minds may not only anticipate what the microscope is to reveal, but help us to understand its revelations.
Page 306 - I. Let us suppose that there are four girls at school, Anna, Bertha, Cora, and Dora, and that some one had observed that (1.) Whenever either Anna or Bertha (or both) remained at home, Cora was at home ; and (2.) When Bertha was out, Anna was out ; and (3.) Whenever Cora was at home, Anna was at home. What information is here conveyed concerning Dora ? Indicating by the capital letters the fact of remaining at home, and by the small letters that of going out, our premises are...
Page 193 - ... needle is increased by the excitement of the magnet, if its lines of force are perpendicular to the plates of the condenser ; but if the condenser plates are parallel to these lines, the capacity is diminished. The percentages of increase in one case and decrease in the other are equal in magnetic fields of the same intensity, and these variations from the normal capacity are greater as the intensity of the field increases. The experiments which led to these conclusions were suggested by Maxwell's...
Page 229 - ... diameters had to be used most of the time. I say, too, that, " after the first few nights, I was surprised at the readiness with which my eye detected any variation from the average appearance of a star of a given faint magnitude : as a consequence whereof my observing-book contains a large stock of memoranda of suspected objects. My general plan with these was to observe with a sufficient degree of accuracy the position of all suspected objects. On the succeeding night of observation they were...

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