. Journal. understandthia peculiar dyeing process, and the manner in whichanything like an efficient circulation of the dye-liquorthrough the cops is obtained. Neither of our principlesbearing on this point is applicable to the machine, and if itis at all possible to dye cops satisfactorily in this machine,it is certain that this can only be achieved with thesubstantive dye-:. To dye basic or acid mordant dyes,indigo or aniline black in this machine is an utterimpossibility. I have seen a number id cops dyed in thismachine with substantive dyes, but the surprising softnessof these cops, althou
. Journal. understandthia peculiar dyeing process, and the manner in whichanything like an efficient circulation of the dye-liquorthrough the cops is obtained. Neither of our principlesbearing on this point is applicable to the machine, and if itis at all possible to dye cops satisfactorily in this machine,it is certain that this can only be achieved with thesubstantive dye-:. To dye basic or acid mordant dyes,indigo or aniline black in this machine is an utterimpossibility. I have seen a number id cops dyed in thismachine with substantive dyes, but the surprising softnessof these cops, although perhaps accounting for the evennessof the dye throughout the cops, is not very promisingwith regard to the result of the subsequent use of thesecops in the loom. P. Kornfelds machine (Ger. Pat. 56,369, July 17,1890)avoids the use of skewers altogether. Each cop is inserted ina tubular ease H (Fig. 10), iu which little projecting platesare provided ill order to compel the dye-liquors to penetrate Fig. into the cops. The apparatus may be useful for ex-periments ou a laboratory scale, but is quite useless forpractical cop-dyeing, owing not only to its output beiDginfinitesimally small, but also to its management being trouble-some in the extreme. A great deal of injury must be done tothe cops by the projecting resistance plates. Herzfeld andStommels machine (D P. A. 11,325) is very much likeKornfelds machine, but those dangerous resistance platesare avoided. But the use of this machine on a large scaleis quite as hopeless as that of Kornfelds machine. Although there is quite a number of other patents forcop-dyeing machines in existence, it would be needless tooccupy space with their description, as they offer noessentially novel points for our consideration. Trorn the above we necessarily come to the conclusionthat only very few of the numerous cop-dyeing machineshave before them any prospect of success as soon as theyare used to dye other than the substantive dyes. And it
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
