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acid action actually added advisable alcohol allow already aperture applied bath bichromate blue bright bromide camera celluloid cent solution clean coated color complete corner correct dark dish dissolved distance Distilled water dried dye solution easily easy edges elements emulsion equal exposed exposure film filter final five fixing front gelatine give given glass green half hour immersed inch latter lens less light method minutes mirror mixed mixture naturally necessary negatives object obtained once ordinary paper photography picture piece pigment placed plate positive possible Potassium practical preferable prepared quantity reflected salt screen screen-plate seen sensitive separate sheet shown side silver slides soak soon square staining stirring strip sufficient suggested surface thickness tion transparency trouble usual violet washed yellow
Page 193 - ... in the proportion of two parts of the former to one of the latter, and expressible by the symbol H2O.
Page 156 - ... evaporation and heating. Take up in acid again as before, filter and wash. Ignite and weigh as silica. This residue is liable to contain traces of iron, titanium and spinel. It may be tested with hydrofluoric acid and any fixed residue deducted. The alumina is now determined in the filtrate from the silica, to which a few drops of nitric acid have been added. In the absence of much manganese this can be done by precipitation with ammonium hydroxide, taking care to have plenty of ammonium chloride...
Page 5 - The angle of view is determined by the focal length of the lens and the size of the plate on which it is used, and when not otherwise specified means the angle in a horizontal direction.
Page 200 - It is named after JT Seebeck, who, prior to 1810, sent to the poet Goethe a treatise on the action of light on silver chloride, in which he disclosed the fact that under the influence of the spectral rays it assumed the colors incident upon it. Sir John Herschel in 1840, Robert Hunt, JW Draper and others followed on the same lines.