Proceedings of the American Academy of Arts and Sciences, Том 48Metcalf and Company, 1913 Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell. |
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Страница 4
... measurements of efficiency would be greatly facilitated . It should here be noted . that Euphos glass appears in ... measuring the radiation directly by means of a thermopile connected with a sensitive galvanometer in a manner familiar ...
... measurements of efficiency would be greatly facilitated . It should here be noted . that Euphos glass appears in ... measuring the radiation directly by means of a thermopile connected with a sensitive galvanometer in a manner familiar ...
Страница 7
... measurements , while it did serve the extremely useful purpose of limiting the total amount of energy to be measured and of eliminating any difficulties that might arise owing to absorption in the further part of the infra red , all the ...
... measurements , while it did serve the extremely useful purpose of limiting the total amount of energy to be measured and of eliminating any difficulties that might arise owing to absorption in the further part of the infra red , all the ...
Страница 8
... measurements with a thermopile , the method adopted worked very smoothly . The drift , however , was usually small and slow and satis- factorily taken care of by a time correction . With proper attention to this , the readings ...
... measurements with a thermopile , the method adopted worked very smoothly . The drift , however , was usually small and slow and satis- factorily taken care of by a time correction . With proper attention to this , the readings ...
Страница 9
... Measurements on various Illuminants . With these preliminaries the apparatus was set up permanently and work begun on commercial illuminants . Readings of current and voltage on the electric lamps were taken by Weston instruments ...
... Measurements on various Illuminants . With these preliminaries the apparatus was set up permanently and work begun on commercial illuminants . Readings of current and voltage on the electric lamps were taken by Weston instruments ...
Страница 12
... measurement further , the Euphos glass was replaced by the light crown glass as before with the result of showing that substantially one half , 49.9 % , of the total ultra violet was cut off by the crown glass and hence substantially 12 ...
... measurement further , the Euphos glass was replaced by the light crown glass as before with the result of showing that substantially one half , 49.9 % , of the total ultra violet was cut off by the crown glass and hence substantially 12 ...
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Страница 109 - Discount to booksellers 25% ; to members 50%, or for whole sets 60%. The individual articles may be obtained separately. A price list of recent • articles is printed on the inside pages of the cover of the Proceedings. Complete Works of Count Rumford. 4 vols., $5.00 each. Memoir of Sir Benjamin Thompson, Count Rumford, with Notices of his Daughter.
Страница 773 - Statuary and casts of sculpture for use as models or for art educational purposes only; regalia and gems, where specially imported in good faith for the use and by order of any society incorporated or established solely for religious, philosophical, educational, scientific, or literary purposes, or for the encouragement of the fine arts, or for the use and by order of any college, academy, school, seminary of learning, orphan asylum, or public hospital in the United States, or any State or public...
Страница 42 - THE wisest man could ask no more of Fate Than to be simple, modest, manly, true, Safe from the Many, honored by the Few ; To count as naught in World, or Church, or State, But inwardly in secret to be great...
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Страница 29 - CEA — (I.) Experiments on the Effect of Freezing and other low Temperatures upon the Viability of the Bacillus of Typhoid Fever, with Considerations regarding Ice as a Vehicle of Infectious Disease. (II.) Statistical Studies on the Seasonal Prevalence of Typhoid Fever in various Countries and its Relation to Seasonal Temperature, pp.
Страница 33 - If we can say that we now know the physical and biological conditions of the great ocean basins in their broad general outlines — and I believe we can do so — the present state of our knowledge is due to the combined work and observations of a great many men belonging to many nationalities, but most probably more to the work and inspiration of Alexander Agassiz than to any other single man.
Страница 773 - Treasury may prescribe, for the payment of lawful duties which may accrue should any of the articles aforesaid be sold, transferred, or used contrary to this provision, and such articles shall be subject, at any time, to examination and inspection by the proper officers of the customs : Provided, That the privileges of this and the preceding section shall not be allowed to associations or corporations engaged in or connected with business of a private or commercial character.
Страница 696 - ... cum semel institerunt vestigia certa viai, sic alid ex alio per te tute ipse videre talibus in rebus poteris caecasque latebras insinuare omnis et verum protrahere inde. quod si pigraris paulumve recesseris ab re, 410 hoc tibi de plano possum promittere, Memmi : usque adeo largos haustus e fontibu...