Thomas Dyke, of Sarum. It consists of an almost cylindrical furnace for water, which contains a smaller one, keeping the suds of the second washing of the wool, to be used with the next quantity of wool, the first way. The whole being a manufacturing process, we refer the reader to the "Letters and Papers of the Bath and West of England Society;" or to the 7th vol. of the "Repertory of the Arts and Manufactures," where he will find it described, together with an illustrative engraving.
In June 1796, a patent was granted to Mr. William Bundy, of Camden-town, Middlesex, for a machine for cutting and making combs; a full description of which, together with a plate, is inserted in the 11th vol. of the last mentioned work.
Combination. See Artificer, vol. i. p. 118.
COMFREY, the Common, or Symphytum officinale, L. a native perennial plant, which grows about two feet high, is found on the banks of rivers, and wet ditches; and produces yellow-white flowers, in the months of May and June. It is eaten by sheep and cows, but horses, goats, and hogs refuse it. The leaves of this plant impart a grateful flavour to cakes and panada; the young stems, when boiled, are excellent and nutritious eating. A decoction of the stalks, with leaves and flowers, gives to wool prepared by a solution of bismuth, a fine and permanent brown colour.
But the most useful part of the Comfrey, is its viscid and mucilaginous root, which may be classed among the neglected treasures of the vegetable kingdom. These roots are, at present, chiefly employed by colour-makers, who, by means of a decoction made of them, extract the beautiful crimson colour from gum-lac. The natives of Angora, who possess the finest breed of goats in the world, prepare from the comfrey-roots a kind of glue, that enables them to spin the fleece into a very fine yarn, from which camblets (See vol. i. p. 425) and shawls are manufactured. The Germans have lately employed the same mucilage for correcting the brittleness of flax, and roughness of wool, in spinning: this preparation neither soils the fingers nor the yarn, and may be preserved in a fresh state for many days, in close wooden boxes.
Tabernamontan, in his German Herbal, relates a curious fact, which, if not exaggerated, would be of great value in the important process of tanning, and rendering leather water-proof. He boiled, in a pailful of water, ten pounds of the fresh root, dug out in November, till one half the liquor was evaporated: with this decoction, when cool, he repeatedly dressed the leather which, thus prepared, became not only more durable than by any other method, but it always remained pliable and elastic.—M. Dörffurth, an apothecary of Wittenberg, in Germany, also employed these roots in his experiments on tanning, with considerable success. After drying and reducing them to powder, or cutting the fresh roots into small pieces, he infused them in a proportionate quantity of water, frequently stirring the mass, till it acquired the consistence of treacle. It was then allowed to stand at rest several days, till the fibrous and woody part had subsided, when the clear fluid was poured off, or passed
