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10th irritations 1st irritations 2d irritations 4th irritations Academy Agassiz Albany Academy Alfred Vail alphabet American apparatus Ascending polarization axis Baron Schilling battery bell Board of Regents Capt cell centimetres chord circuit coast coil collections Condorcet connection Daboll trumpet Daniel Daniel cells direction discovery distance effect electric telegraph electro-magnetic telegraph excitability experiments fact feet Fish Commission fog-signal galvanic galvanometer George's Bank heard heat Henry's inches increased instrument invention investigations irritating current irritations.—Salt solution Island lcell length letter Light-House Light-House Board magnet ment miles Morse's needle nerve observed obtained Paris patent periment polarizing current produced Prof Professor Henry Professor Morse Rana temporaria Remarks Report rheo rheochord Samuel F. B. Morse schooner scientific Secretary signal siren Smithsonian Institution Society sound species specimens station steam steamer surface tion trumpet United States Fish Vail velocity vessel Washington whistle wind wire York
Page 153 - ... as they shall deem best suited for the promotion of the purpose of the testator, anything herein contained to the contrary notwithstanding.
Page 287 - ... intensity and quantity magnets were introduced to avoid circumlocution, and were intended to be used merely in a technical sense. By the intensity magnet I designated a piece of soft iron so surrounded with wire that its magnetic power could be called into operation by an intensity battery ; and by a quantity magnet a piece of iron so surrounded by a number of separate coils that its magnetism could be fully developed by a quantity battery.
Page 345 - It was my wish, in every statement, to render Mr. Morse full and scrupulous justice. While I was constrained, therefore, to state that he had made no discoveries in science, I distinctly declared that he was entitled to the merit of combining and applying the discoveries of others, in the invention of the best practical form of the magnetic telegraph. My testimony tended to establish the fact that, though not entitled to the exclusive use of the electro-magnet for telegraphic purposes, he was entitled...
Page 264 - Lucretius, gives an account of a chimerical correspondence between two friends by the help of a certain loadstone, which had such a virtue in it, that if it touched two several needles, when one of the needles so touched began to move, the other, though at never so great a distance, moved at the same time, and in the same manner.
Page 300 - Up to the autumn of 1837 my telegraphic apparatus existed in so rude a form that I felt a reluctance to have it seen. My means were very limited — so limited as to preclude the possibility of constructing an apparatus of such mechanical finish as to warrant my success in venturing upon its public exhibition. I had no wish to expose to ridicule the representative of so many hours of...
Page 171 - Contributions to Electricity and Magnetism. No. II. On the influence of a Spiral Conductor in increasing the intensity of Electricity from a Galvanic arrangement of a single Pair, etc.
Page 37 - Sydney : The Mammals of Australia, illustrated by Miss Harriett Scott and Mrs. Helena Forde. With a short account of all the species hitherto described. By Gerard Krefft.
Page 166 - It is, however, more in accordance with all the phenomena of cohesion to suppose, instead of the attraction of the liquid being neutralized by the heat, that the effect of this agent is merely to neutralize the polarity of the molecules so as to give them perfect freedom of motion around every imaginable axis.
Page 159 - At the same time he developed the relation of the intensity magnet to the intensity battery, and their relations to the magnet of quantity. He thus made the electro-magnet capable of transmitting power to a long distance, demonstrated the principle and perfected the magnet applicable to the purpose, was the first actually to magnetize a piece of iron at a distance, and to demonstrate and declare the applicability of the electro-magnet to telegraphy at a distance. Using the terminal short-circuit...