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Página 11 - An Act for the more effectual relief of the destitute poor in Ireland...
Página 203 - ... of the total light reflected, and in short exposures is such as would easily escape notice. Nevertheless, if a slip of this paper be held for only four or five seconds in the sun (the effect of which is quite imperceptible to the eye), and when withdrawn into the shade be washed over with the ferrosesquicyanate of potash, a considerable deposit of Prussian blue takes place on the part sunned, and none whatever on the rest, so that on washing the whole with water, a pretty strong blue impression...
Página 210 - Both phosphorus and arsenic (bodies remarkable for sesqui-combinations) admit isomeric forms in their oxides and acids. But to return from this digression. " If to a mixture of ammonio-citrate of iron and sulphocyanate of potash, a small dose of nitric acid be added, the resulting red liquid, spread on paper, spontaneously whitens in the dark. If more acid be added till the point is attained when the discoloration begins to relax, and the paper when dry retains a considerable degree of...
Página 311 - Rapports public par 1'Academie Royale des Sciences et Belles Lettres de Bruxelles. Annuaire de 1'Observatoire Royal de Bruxelles, pour 1'an 1841. Par le Directeur, A. Quetelet. Annuaire de l'Academie Royale des Sciences et Belles Lettres de Bruxelles.
Página 185 - This is also the place to observe that the colour of a flower is by no means always, or usually, that which its expressed juice imparts to white paper. In many cases the tints so imparted have no resemblance to the original hue. Thus, to give only a few instances, the red damask rose of that intense variety of...
Página 208 - In further development of these most interesting processes Sir John Herschel says : — " The varieties of cyanotype processes seem to be innumerable, but- that which I shall now describe deserves particular notice, not only for its pre-eminent beauty while in progress, but as illustrating the peculiar power of the ammoniacal and other persalts of iron above-mentioned to receive a latent picture, susceptible of development by a great variety of stimuli.
Página 186 - The paper should be moistened at the back by sponging and blotting off. It should then be pinned on a board, the moist side downwards, so that two of its edges (suppose the right-hand and lower ones) shall project a little beyond those of the board. The board being then inclined twenty or thirty degrees to the horizon, the alcoholic tincture (mixed with a very little water, if the petals...
Página 11 - An Act for the Amendment and better Administration of the Laws relating to the Poor in England and Wales...
Página 197 - ... yellow show little more than a trace of action. A photograph impressed on this paper is reddened by muriatic acid fumes. If then transferred to an atmosphere of ammonia, and when supersaturated the excess of alkali allowed to exhale, it is fixed, and of a dark green colour.