Scientific Writings of Joseph Henry, Volumul 30,Ediția 2Smithsonian institution, 1886 |
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action ætherial medium amount of heat appear ascending atmos atmosphere atoms attraction ball body bulb carbonic acid charged cloud column condensation condition conductor connected continued cooled cubic foot degree diameter diminished direction discharge distance earth effect elastic force electroscope elevation equal equator equilibrium exhibited experiment fact feet give given glass globe greater Gulf of Mexico Gulf Stream hence inches inches of mercury increase indicated induction intensity lamp lard oil latent heat latitude light light-house liquid lower magnet matter mercury metal meteorology moisture motion mountain observations ocean oxygen pass perature phenomena plant portion pressure principles produced quantity radiation rain rays regions result side Smithsonian Smithsonian Institution sound space specific gravity sperm oil storm stratum substance sufficient suppose surface take place temperature tend thermometer tion tricity tube upper vapor vessel weight whole wind wire
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Pagina 68 - From the Rocky Mountains to the Pacific, with the exception of the rich but narrow belt along the ocean, the country may also be considered, in comparison with other portions of the United States, a wilderness unfitted for the uses of the husbandman ; although in some of the mountain valleys, as at Salt Lake, by means of irrigation, a precarious supply of food may be obtained...
Pagina 53 - On either side of this zone and converging toward it are the trade winds, which blow from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere. The...
Pagina 138 - Wood fires give us heat and light which has been got from the Sun a few years ago. Our coal fires and gas lamps bring out, for our present comfort, heat and light of a primeval Sun, which have lain dormant as potential energy beneath seas and mountains for countless ages.
Pagina 433 - I was the first to prove by actual experiment that in order to develop magnetic power at a distance, a galvanic battery of intensity must be employed to project the current through the long conductor, and that a magnet surrounded by many turns of one long wire may be used to receive this current.
Pagina 403 - The Greek architect was untrammelled by any condition of utility. Architecture was with him in reality a fine art. The temple was formed to gratify the tutelar deity. Its minutest parts were exquisitely finished, since nothing but perfection on all sides and in the smallest particulars could satisfy an all-seeing and critical eye. It was intended for external worship, and not for internal use. It was without windows, entirely open to the sky, or, if closed with a roof, the light was merely admitted...
Pagina 227 - ... valuable part, it is caught and condensed into the liquid form. The vapor arising from damp linen, if caught and condensed would be distilled water ; the vapor given out by bread while baking, would, if collected, be a spirit like that obtained in the distillation of grain. 157. Latent...
Pagina 435 - ... with the galvanic apparatus. All the circumstances attending this visit to Albany are fresh in my recollection, and during the past years, while so much has been said respecting the invention of electric telegraphs, I have often had occasion to mention the exhibition of your electric telegraph in the Albany Academy, in 1832. If at any time or under any circumstances this statement can be of service to you in substantiating your claim to such a discovery at the period named, you are at liberty...
Pagina 435 - Rensselaer School, in Troy, New York, in August 1832, I visited Albany with a friend, having a letter of introduction to you from Professor Eaton. Our principal object was to see your electro-magnetic apparatus, of which we had heard much, and at the same time the library and collections of the Albany Institute. " ' You showed us your laboratory in a lower story or...
Pagina 126 - The consumption of internal power does not however stop with the development of the young animal, as it does in the case of the young plant. "The young animal is in an entirely different condition : exposure to the light of the sun is not necessary to its growth or its existence: the chemical ray by impinging on the surface of its body does not decompose the carbonic acid which may surround it, the conditions necessary for this decomposition, not being present. It has no means by itself to elaborate...
Pagina 427 - Sturgeon employed a bent wire of soft iron. The difference in the arrangement at first sight might appear to be small, but the difference in the results produced was important, since the temporary magnetism developed in the arrangement of Sturgeon was sufficient to support a weight of several pounds; and an instrument was thus produced of value in future research. The next improvement was made by myself. After reading an account of the galvanometer of Schweigger, the idea occurred to me that a much...