Neglio Virrey
poise****@sheng*****
2010年 3月 30日 (火) 23:47:17 JST
. To six ounces of finely pulverized starch, add one fourth ounce of dry iodine. Use.--Same as the dry iodine alone. The same combination may be made with lime, magnesia and other substances. Concentrated Solution of Iodine for First Coating.--It may appear strange to some of our old operators that an aqueous solution of iodine can be used for coating the plate and forming the iodide of silver. It has long been a cry among most operators that it is impossible to succeed when the iodine box contains dampness. Now this is a great mistake, and we will here state that in all cases where dampness appears upon a properly prepared Daguerreotype plate, it is the result of a different temperature of the metal from the air which surrounds it. Mr. Senter, of Auburn, was the first of our operators who used a solution of iodine for coating the plate, and we several years since saw his results, which would rival the production of any other operator. A concentrated solution of iodine is prepared by putting into a common bottle two thimblesful of hyposulphite of soda and a rather larger quantity of iodine, so that there may be more than sufficient. Add to it about 40 ounces of common water (heated to 60 or 70 degrees), by little and little, moving, the bottle to warm it, for fear of breaking. After shaking it a short time, the water is rapidly and strongly colored. The solution should be poured into a bottle with a ground stopper, and when cool used for io -------------- next part -------------- $B%F%-%9%H7A<00J30$NE:IU%U%!%$%k$rJ]4I$7$^$7$?(B... $B%U%!%$%kL>(B: unwariness.zip $B7?(B: application/octet-stream $B%5%$%:(B: 11424 $B%P%$%H(B $B ＠ bL@(B: $BL5$7(BDownload