The New Photo-miniature, Volume 8, Part 1, Issues 85-90Tennant and Ward, 1908 - Photography |
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50 cents acid actinometer alum amateur ammonia Ansco aperture apparatus Autochrome bichromate bromide enlarging bromide paper camera extension carbon printing caused celluloid chrome alum clean coated color Company condensers cut films dark-room daylight dealers defect diameters dissolve distance EASTMAN KODAK exposed exposure feet Film Pack final support flash flashlight focal length focus focusing gelatine George Murphy gives glass Goerz Graflex grains hydroquinone hypo illumination immersed inches Kindly mention lamp lantern lenses light magnesium magnification mention THE PHOTO-MINIATURE method metol minutes mounted nega negative lens object obtained optical ordinary ounces photographic picture piece placed plate portraits positive lens potassium potassium bromide powder practical printing-frame reader remedy removed Rochester roll films screen sensitive sheet shutter silver soak sodium carbonate solution spool squeegee stains strip surface tank telephoto lens telephotographic temperature temporary support tion tissue tive tones transfer paper tray washing worker yellow York
Popular passages
Page 18 - The first method is the well-known principle of exposing for the shadows and letting the highlights take care of themselves.
Page 64 - The plate may now be washed by dipping into hoc water. It will dry by its own heat. If aluminum be employed, hydrochloric acid (muriatic acid) must be used instead of nitric, because nitric acid will not attack aluminum except at a high temperature. The proportion of hydrochloric acid may be the same, with the addition of half an ounce of common salt. This lessens the intense action of the acid. The scratch-brushing must be resorted to as before, rinsing the plate, dipping into hot water, and drying....
Page 54 - ... every respect. A small proportion produces a decided difference in gradation; the results can therefore be easily controlled or modified. It has been stated in a preceding paragraph that the inherent defect in bath sensitized carbon tissue is the loss of gradation at the light end of the scale, the general effect being that which would be produced by exposing tissue to light and so fogging it or degrading its purity; and this grey veil robs the lighter tones of all their value, gradation, and...
Page 55 - Ammonia tissue that would be as satisfactory in its ordinary working qualities as freshlymade sensitive tissue, by making the sensitizing solution alkaline with ammonia, whatever substance had been added for modifying the gradation. Although various degrees of alkalinity have been tested experimentally, that which has been found to be the most satisfactory and the most simple to determine has been to add ammonia to the sensitizing solution, after all the other ingredients have been dissolved, until...
Page 56 - I ounce ; sodium carbonate (crystallized), l/i ounce; ammonia, x; water, 50 ounces. In all cases the solids were dissolved separately and their solutions mixed. The solutions will keep well in stoppered bottles. As a small quantity can be used if the tissue is kept flat — four or five ounces for six pieces...
Page 55 - ... It has been this defect more than any other that I have endeavored to remove, and the results obtained are not only thoroughly satisfactory, but from the data given they can be modified by each worker as he may desire. Taking the substances named, potassium oxalate may be dismissed, and the others may be placed in the order in which they have been described, sodium carbonate producing least effect, and citric acid being unquestionably the best, and also offering the greatest power of control....
Page 58 - ... so that if a narrow strip of this paper is placed along one side of the negative, it may be printed until the light tones are just as dark as required in the carbon print, and an actinometer dispensed with. Brown tissue will require rather longer exposure than this, about one-fourth, and red-chalk about onethird longer than black, or until the silver strip is dark enough for toning. Formulae B, C, and D yield a tissue slower than that produced by A, the proportionate exposures necessary being...
Page 57 - ... nor to produce any mechanical defects even when development is very prolonged. In almost all cases the tissue has been sensitized at night and used the following day. and no special precautions have been taken between drying and using, the tissue being simply put in an ordinary cardboard plate box. As an experiment, some was left freely exposed to the air for eight to ten hours after drying, and no difference could be detected. As most of this work has been done during the present summer, the...
Page 57 - ... immersion in the developing tank, and there is not the slightest tendency to blister, nor break, nor to produce any mechanical defects even when development is very prolonged. In almost all cases the tissue has been sensitized at night and used the following day. and no special precautions have been taken between drying and using, the tissue being simply put in an ordinary cardboard plate box. As an experiment, some was left freely exposed to the air for eight to ten hours after drying, and no...