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acid actinic action advantage angle aperture appear arrangement artistic bath solution better bottle camera chemicals class of subjects clean collodion Collodion process colour combination considerable copying crown glass Dallmeyer's dark definition depth of focus desirable diameter diaphragm diffused light dimensions double lens effect executed exposure film fixed flint glass focal length focusing screen fogging give grains gutta percha half hypo instantaneous landscape lenses less light and shade manipulation meniscus microscope Mode nature necessary negative nitrate bath nitrate of silver nitric acid objects obtained operator optician orthoscopic paper pencils perfect photographic photographic lens picture plate portion portrait lens portraiture position possess Precautions printing qualities rapid rapid rectilinear rays reflexion refracted result retina shutter single lens sitter sizes slide spherical aberration stereoscopic surface taken temperature tion tissue toning treatment triplet ture varnish Voigtlander washed whilst writer yellow
Page 293 - in nitro-hydrochloric acid. The deep yellow solution thus obtained yields, by evaporation, yellow crystals of the double chloride of gold and hydrogen; when this is cautiously heated, hydrochloric acid is expelled, and the residue, on • cooling, solidifies to a red crystalline mass of
Page 4 - Posterity, by the agency of Photography, will view the faithful image of our times; the future student, in turning the page of history, may at the same time look on the very skin, into the very eyes, of those, long since mouldered to dust, whose lives and deeds he traces in the text.
Page 21 - beyond it; on looking intently at either we are conscious of the presence of the other, but we do not discriminate its details; on fixing one we lose the definition of the other.
Page 190 - in the general landscape, fine broad effects of light and shade will supersede it all. Mere clean mechanism on the plate grows monotonous, and will always succumb to the sentiment conveyed to the mind of the spectator by representations—photographically less
Page 294 - is decomposed by light both in a dry and wet state; very slowly if pure, and
Page 62 - diagram will give the student a good idea of the action of the diaphragm on a Portrait Lens. The dark lines AA, represent the depth and direction of the focus of the lens at full aperture. The curvature of the field is purposely exaggerated in order better to show the subsequent result. We will take the
Page 65 - but at the loss of rapidity of execution by the abstraction of a corresponding illuminating area. The length of the focal distance from the back lens to the film is increased, but with a wellcorrected lens of "long focus," the field, under such conditions of aperture, is very nearly