Journal of the Franklin Institute

Pergamon Press, 1845

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Seite 375 - What I claim as my invention, and which I desire to secure by letters patent, is the mode of hardening steel so as to render it flexible by means of the composition of oil, charcoal, and borax, as set forth.
Seite 43 - Happy is the man that findeth wisdom, and the man that getteth understanding. For the merchandise of it is better than the merchandise of silver, and the gain thereof than fine gold.
Seite 31 - 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 136 - Paper proper for producing an amphitype picture may be prepared either with the ferro-tartrate, or the ferro-citrate, of the protoxide, or the peroxide, of mercury, or of the protoxide of lead, by using creams of these salts, or by successive applications of the nitrates of the respective oxides, singly, or in mixture, to the paper, alternating with solutions of the ammonio-tartrate, or ammouio-citrate, of iron,* the latter solutions being last applied, and in more or less excess.
Seite 89 - ... and in the submitting of the compound thus formed to the action of heat at a regulated temperature, by which combination and exposure to heat it will be so far altered in its qualities as not to become softened by the action of the solar ray or of artificial heat at a temperature below that to which it was submitted in its preparation — say to a heat of 270° of Fahrenheit's scale— nor will it be injuriously affected by exposure to cold.
Seite 350 - The first object was obtained by the successive action of two air-pumps; the first having a piston of one inch in diameter, by which the gas to be condensed was forced into the cylinder of the second pump, the diameter of whose piston was only half an inch. The tubes into which the air, thus further condensed, was made to pass, were of green bottle glass, from...
Seite 137 - If, then, the process have been successful, a perfectly black positive picture is at once developed. At first it most commonly happens that the whole picture is sooty or dingy to such a degree that it is condemned as spoiled, but on keeping it between the leaves of a book, especially in a moist atmosphere, by extremely slow degrees this dinginess disappears, and the picture disengages itself with continually increasing sharpness and clearness, and acquires the exact effect of a copper-plate engraving...
Seite 138 - Amphitype, — a name suggested by Mr. Talbot, to whom I communicated this singular result ; and to this process, or class of processes (which I cannot doubt when pursued will lead to some very beautiful results), I propose to restrict the name in question, though it applies even more appropriately to the following exceedingly curious and remarkable one, in which silver is concerned. At the last meeting I announced a mode of producing, by means of a solution of silver, in conjunction with ferro-tartaric...
Seite 138 - The, solution then described, and which had, at that time, been prepared some weeks, I may here incidentally remark, has retained its limpidity and photographic properties quite unimpaired during the whole year since elapsed, and is now as sensitive as ever, — a property of no small value. Now, when a picture (for example, an impression from an engraving.) is taken...

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