Bulletin of the Philosophical Society of Washington, Volumes 3-4Philosophical Society of Washington (Washington, D.C.), Philosophical Society of Washington, Washington, D.C. co-operation of the Smithsonian Institution, 1880 Vols. 6-12 include the Proceedings of the society's Mathematical Section, 1883-1892. |
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Common terms and phrases
ABBE American amount annual ANTISELL April April 11 Army Medical Museum audible effects beam of sunlight cent Chair CLEVELAND ABBE Coast coin coinage Committee communication currency diaphragm distance EDGAR FRISBY election equal equation Essex county experiments February February 24 flora genera gold HARKNESS hearing-tube Henry HILGARD intermittent beam January 17 Journal June lamp-black last meeting legal tender light longitude March March 29 means Medical and Surgical meeting were read members present Messrs metals method miles Monocotyledons musical tone names November object observations obtained October Otis paper payment Permian PHILOSOPHICAL SOCIETY photophone plants Plover Bay President Prof read and adopted receiver Remarks scientific selenium shown silver dollar SIMON NEWCOMB SOCIETY OF WASHINGTON sonorous sounds produced species spectrum sub-gentes substances Surgeon General's Office Tainter test-tube tion ultra-red United vibration W. H. DALL WILLIAM WOODWARD
Popular passages
Page 82 - Dollars, or units ; each to be of the value of a Spanish milled dollar as the same is now current, and to contain three hundred and seventy-one grains and foursixteenth parts of a grain of pure, or four hundred and sixteen grains of standard, silver.
Page 132 - ... their hair. If the child belongs to the Pipe or Eagle sub-gens, charcoal, blue-clay and the skin of a wild-cat are placed beside him, as the articles not to be touched by him in after life. Then they say to him " this you must not touch ; this too you must not touch, and this you must not touch." The blue clay symbolizes the blue sky. [Now according to the Iowa myth, the Eagle people came down from the sky.] Worship of the Thunder-God. — When the first thunder is heard in the spring of the...
Page 66 - Prodromus, and claimed to exhibit " a list of all the plants which have as yet been collected," though now rare, and long out of print, is still to be found in a few botanical libraries. I have succeeded in securing a copy of this work, and have been deeply interested in comparing the results then reached with those which we are now able to present.
Page 114 - July, 1862; which is to be set apart as a sinking fund; and the interest of which shall in like manner be applied to the purchase or payment of the public debt, as the Secretary of the Treasury shall from time to time direct.
Page 160 - Although the experiments so far made can only be considered as preliminary to others of a more refined nature, I think we are warranted in concluding that the nature of the rays that produce sonorous effects in different substances depends upon the nature of the substances that are exposed to the beam, and that the sounds are in every case due to those rays of the spectrum that are absorbed by the body.
Page 78 - Treasury is required to purchase monthly not less than two million nor more than four million dollars' worth of silver, and coin the same into dollars, 'each dollar weighing 412^ grains, and being nine-tenths fine.
Page 149 - I imagine that in some such manner as this a wave of condensation is started in the atmosphere each time a beam of sunlight falls upon lampblack, and a wave of rarefaction is originated when the light is cut off. We can thus understand how it is that a substance like lampblack produces intense sonorous vibrations in the surrounding air, while at the same time it communicates a very feeble vibration to the diaphragm or solid bed upon which it rests.
Page 143 - 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 this failure was explained upon the supposition that the molecular disturbance produced by the light was chiefly a surface action, and that under the circumstances of the experiments...
Page 23 - ... as one which seems to him difficult to explain on any theory that the aurora was a local phenomenon. The meeting then adjourned. 186TH MEETING. OCTOBER 23, 1880. The President in the Chair. The minutes of last meeting were read and adopted. The President notified the meeting of the decease of General A. J. MYEK, one of the members of the Society. Dr. TONER moved the appointment of a committee to draft resolutions suitable to the occasion. Committee appointed : Messrs. JC WELLING, CLEVELAND ABBE
Page 150 - Rayleigh has shown mathematically that a two-and-fro vibration of sufficient amplitude to produce an audible sound would result from a periodical communication and abstraction of heat, and he says : " We may conclude, I think, that there is at present no reason for discarding the obvious explanation that the sounds in question are due to the bending of the plates under unequal heating.