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Updated: June 11, 2025
In short, I believe a collodion transfer cannot be made even comparatively permanent, unless an amount of care be taken in the making of it which is neither compatible nor consistent with the popular price and extensive output. How now stands the case with an argentic enlargement?
Anderson will fasten this tube on to our generator, and we shall have a stream of hydrogen here with which we can charge this balloon made of collodion. You will see they will all remain floating about until the gas escapes. What, then, are the comparative weights of these substances? I have a table here which will shew you the proportion which their weights bear to each other.
Those liable to chilblains should take open-air exercise, nourishing food, cod-liver oil, and tonics. Woollen stockings and gloves should be worn in cold weather, and sudden changes of temperature avoided. The symptoms may be relieved by ichthyol ointment, glycerin and belladonna, or a mixture of Venice turpentine, castor oil, and collodion applied on lint which is wrapped round the toe.
There is a natural hesitation to excise keloid because of the fear of its returning in the new scar. The application of radium is, so far as we know, the only means of preventing such return. The irritation associated with keloid may be relieved by the application of salicylic collodion or of salicylic and creosote plaster.
Substances necessary for the photographic reproduction, collodion for preparing the glass plate, nitrate of silver to render it sensitive, hyposulfate of soda to fix the prints obtained, chloride of ammonium in which to soak the paper destined to give the positive proof, acetate of soda and chloride of gold in which to immerse the paper, nothing was wanting.
A very handy way of drying is to have a flat tin box of the usual hot plate description, which fill with hot water, then screw on the cap; on this flat tin box place the plates to dry, which they will do rapidly; when dry, store away in your plate box, and you will have a supply of really excellent dry collodion plates. Just a word as to the preparation of the glasses before coating.
We have plunged this into the bath, which contains chiefly nitrate of silver, but also some iodide of silver, knowing that a decomposition will take place, in consequence of which the iodide of ammonium will become changed to the iodide of silver, which will now fill the pores of the collodion film. The iodide of silver is eminently sensitive to light.
The majority of so-called corn solvents consist of a solution of salicylic acid in collodion; if this is painted on daily, the epidermis dies and can then be pared away. The unskilful paring of corns may determine the occurrence of senile gangrene in those who are predisposed to it by disease of the arteries. [Illustration: FIG.
Anthony's quick collodion, and has repeatedly obtained the full moon by means of it in one-third of a second. In the last "Annual of Scientific Discovery" are interesting notices of photographs of the sun, showing the spots on his disk, of Jupiter with his belts, and Saturn with his ring.
Most plate makers use the wet plates as their standard, giving the sensitiveness of the dry plates at from two to sixty times greater; but as wet plates vary quite as much as dry ones, depending on the collodion, condition of the bath, etc., this system is very unsatisfactory. Another method, employed largely in England, depends on the use of the Warnerke sensitometer.
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