Page:Willich, A. F. M. - The Domestic Encyclopædia (Vol. 2, 1802).djvu/74

56] Description of the different articles, as they are combined to form this machine, when made portable.

Fig. 1. R, is the lamp for the machine.

Fig. 2. is the lamp, in combination with the two ovens, and the boiler or vessel for raising steam, and boiling any substance in water. P, is the baking oven. Q, is the heating oven. R, the end of the lamp; and S, is the vessel for boiling in, and raising steam for other purposes.

This machine, and its various component parts, may be constructed of any of the different metals, of which similar articles are usually made. And, though it is at present described only as operating with a lamp and oil, yet the patentee proposes to construct such as may be used with common fuel, as wood, coal, &c. upon different scales or sizes.  COPAIBA, or of, a liquid resinous juice, issuing from incisions made in the trunk of the Copaifera balsamum, L. a tree growing in the Spanish West Indies, of which there is only one species.

The juice is clear and transparent, of a whitish or pale yellowish colour, an agreeable smell, and a bitterish pungent taste. It is usually about the consistence of oil; when long kept, though retaining its transparency, it becomes nearly as thick as honey; and, unlike other resinous juices, does not acquire a solid state.

Genuine balsam of copaiba dissolves entirely in rectified spirits, especially if a little alkali be previously added to the liquor: the solution has a very fragrant smell. When distilled with water, it yields a large quantity of a limpid essential oil: and in a strong heat, without addition, an oil of a blue colour.

With respect to the medicinal properties of this balsam, it is said to be both corroborant and detergent. It strengthens the nervous system, tends to open the bowels, in large doses proves purgative, and promotes the secretion of urine. It has also been recommended in dysenteries, and in diseases of the breast and lungs. observes, that he has known very dangerous coughs, cured by the use of this balsam alone; and though, being hot and bitter, it produces good effects, even in hectic cases. We advise, however, great circumspection in its use; as it can be of service only in particular circumstances. The dose of this medicine, should not exceed from 20 to 30 drops. It may be conveniently taken when mixed with a thin syrup, or in the form of an emulsion, into which it may be reduced, by triturating it with a thick mucilage of gum arabic, till both ingredients are well incorporated, and then gradually adding a proper quantity of water.  COPAL, improperly called Gum copal, is a resinous substance obtained from the concrete juice of the Rhus copallinum, or narrow-leaved sumach, a native plant of North America, known there by the name of Beach-sumach. This resin is imported in irregular masses, some of which are transparent, of a yellowish or brown colour, others are whitish and semi-transparent. It possesses a more agreeable odour than frankincense, but is, unlike other gums and  sins,