THE TECHNICAL REPOSITORY, CONTAINING Practical Information ON SUBJECTS CONNECTED WITH DISCOVERIES AND IMPROVEMENTS IN THE USEFUL ARTS. ILLUSTRATED BY NUMEROUS ENGRAVINGS BY THOMAS GILL, A CHAIRMAN OF THE COMMITTEE OF MECHANICS IN THE SOCIETY FOR THE ENCOURAGEMENT OF ARTS, MANUFACTURES, AND CONTINUED MONTHLY. VOL. V. LONDON: PRINTED BY R. WATTS, FOR THE PROPRIETORS. PUBLISHED BY T. CADELL, STRAND; AND SOLD BY SLATTER & MUNDAY, OXFORD; DEIGHTONS, CAMBRIDGE; CUMMING, DUBLIN; THE TECHNICAL REPOSITORY. ་་ I-Specification of the Patent granted to RICHARD BadNALL, of Leek, in the County of Stafford, Silk Manufacturer; for certain Improvements in Dyeing.-Dated June 3, 1823. I, THE said Richard Badnall, do hereby declare, that the nature of my said invention, and the manner in which the same is to be performed, are particularly described and ascertained in and by the following specification thereof;that is to say: My improvements in dyeing consist, First, in the application of Prussian blue to the purposes of dyeing silk, cotton, wool, or any other article; and, Secondly, in the application of pressure to dyeing in general. The following is my method of dyeing by means of Prussian blue. The Prussian blue, being previously ground as fine as possible, is to be put into any convenient vessel of glass or earthenware. Strong muriatic acid is to be poured upon it, a little at a time; and the mass is to be kept constantly stirred, with a rod of white wood, a piece of tobacco-pipe, or any other material not liable to be acted on by the acid.. The stirring must be continued, till the mixture has become a smooth homogeneous mass of a semi-gelatinous consistence. The proportion of acid requisite for this purpose depends, in some degree, on the quality of the Prussian blue, and therefore cannot be precisely set forth in words; but, by proceeding carefully, as above described, it is impossible to fall into error; as the mixture, if made too thin from excess of acid, may be rectified by the subsequent addition of more Prussian blue. |