Journal of the Franklin Institute, Band 34;Band 64Pergamon Press, 1857 Vols. 1-69 include more or less complete patent reports of the U.S. Patent Office for years 1825-59. Cf. Index to v. 1-120 of the Journal, p. [415]. |
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Seite 213 - The Committee on Science and the Arts, constituted by the Franklin Institute of the State of Pennsylvania for the promotion of the Mechanic Arts, to whom was referred for examination, two reflecting telescopes, made by Mr.
Seite 141 - The Committee on Science and the Arts constituted by the Franklin Institute of the State of Pennsylvania, for the promotion of the Mechanic Arts, to whom was referred for examination a Solar Compass, invented by WM.
Seite 374 - But fortunately the dif*"'£• 2. ference is really very slight ; for a very small change in the latter hypothesis will make its result identical with that of the former. Conceive the straight line which rests on the two profiles to move on them in such a way as always to '" divide them proportionally, as in fig. 3. The surface" thus generated is identical with that of fig.
Seite 279 - mixed contrast," arises the rule that a brilliant color should never be looked at for any length of time, if its true tint or brilliancy is to be appreciated ; for if a piece of red cloth is looked at for a few minutes, green, its complementary color, is generated in the eye, and adding itself to a portion of the red, produces black, which tarnishes the beauty of the red. This contrast explains, too, why the tone of a color is modified, either favorably or otherwise, according to the color which...
Seite 404 - That they were not due to aqueous vapour was further shown by the fact that they could be produced by the combustion of carbonic oxide. He referred the sounds to successive explosions produced by the periodic combination of the atmospheric oxygen with the issuing jet of hydrogen gas. This is undoubtedly the true source of the sounds. I am not aware that the dependence of the pitch of the note on the size of the flame has as yet been noticed. To this point I will, in the first place, briefly direct...
Seite 277 - simultaneous " contrast is the most interesting and useful to be acquainted with. When two colored surfaces are in juxtaposition, they mutually influence each other, — favorably, if harmonizing colors, or in a contrary manner, if discordant ; and in such proportion, in either case, as to be in exact ratio with the quantity of complementary color which is generated in the eye. For example, if two...
Seite 409 - I hence concluded that the explosions, the repetition of which produces the musical sound in the case before us, rendered, at the moment they occurred, the combustion so perfect as to extinguish the solid carbon particles, but I imagined that the images on the screen would, on closer examination, be found united by spaces of blue, which, owing to their dimness, were nut seen by the method of projection.
Seite 209 - Here the blue colour again disappeared, and with it a great part of the yellow, which only remained in spots. These were then very easily got rid of by dilute sulphuric acid alone. The explanation of this process is easy. By the formation of prussian blue, the oleic acid is separated from the oxide of iron. The carbonate of potash then brought into action combines with the oleic acid, decomposes the prussian blue, and at the same time also dissolves the greater part of the oxide of iron, so that...
Seite 409 - In these experiments, that half of the tube which was turned towards the screen was coated with lampblack, so as to cut off the direct light of the jet from the screen.
Seite 209 - ... iron. The carbonate of potash then brought into action combines with the oleic acid, decomposes the prussian blue, and at the same time also dissolves the greater part of the oxide of iron, so that almost all the iron-mould disappears from the stuff simultaneously with the prussian blue. Caustic lye does not act in the same way ; it certainly destroys the blue, but the rusty yellow remains, because it has not the same solvent action upon oxide of iron as carbonate of potash.— Polyt.