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Page 169 - By JOHN WILLIAM DRAPER, MD, Professor of Chemistry in the University of New York.
Page 459 - Boston paper the discovery was announced, that thin disks of very many different substances emitted sounds when exposed to the action of a rapidly-interrupted beam of sunlight. The great variety of material used in these experiments led me to believe that sonorousness under such circumstances would be found to be a general property of all matter. At that time we had failed to obtain audible effects from masses of the various substances which became sonorous in the condition of thin diaphragms, but...
Page 246 - It is hardly an exaggeration to say that the tip of the radicle thus endowed, and having the power of directing the movements of the adjoining parts, acts like the brain of one of the lower animals ; the brain being seated within the anterior end of the body, receiving impressions from the sense organs, and directing the several movements
Page 480 - To avoid in future any misunderstandings upon this point, we have decided to adopt the term "radiophone" proposed by M. Mercadier, as a general term signifying an apparatus for the production of sound by any form of radiant energy, limiting the words thermophone, photophone, and actinophone to apparatus for the production of sound by thermal, luminous or actinic rays respectively. M. Mercadier, in the course of his researches in radiophony, passed an intermittent beam from an electric lamp through...
Page 105 - The ice in general had a semi-stratified appearance, as if it still retained the horizontal plane in which it originally congealed. The surface was always soiled by dirty water from the earth above. This dirt was, however, merely superficial.
Page 147 - The Climatic Changes of later Geological Times : a Discussion based on Observations made in the Cordilleras of North America.
Page 187 - ... and it may advantageously rise to 1 and even 2 per cent as a maximum. Beyond the latter figure it seems in no case to act more favorably than a less amount, unless it be mechanically.
Page 483 - Our experiments upon the range of audibility of different substances in the spectrum have led us to the construction of a new instrument for use in spectrum analysis...
Page 161 - " to the cherished and revered memory of my Master in Science, Nathaniel Bowditch, the father of American Geometry.
Page 480 - A continuous increase in the loudness of the sound was observed upon moving the receiver, G, gradually from the violet into the ultra-red. The point of maximum sound lay very far out in the ultra-red. Beyond this point the sound began to decrease, and then stopped so suddenly that a very slight motion of the receiver, G, made all the difference between almost maximum sound and complete silence.