This useful tree flourishes with greatest luxuriance on the north and north-east sides of hills, in a poor and sandy soil, especially where this is mixed with loam. If planted among rocks, or in bogs, it seldom attains a large size; in black soil it becomes diseased; and in chalky land it frequently pines away and dies.
Its timber, under the name of deal, is employed as the wood-work of houses; for rafters, flooring, doors, the frames of windows, tables, boxes, and other purposes, infinitely too various to be enumerated. Frigates, and other ships of large size, have sometimes been constructed of deal but these are by no means so durable as vessels that are built of oak. Much of the deal which we use is imported from Norway, and other northern parts of Europe. That from Christiana, which is called yellow deal, or red deal, is frequently brought over in planks, but more commonly in boards, each about ten inches and half in width. The wood of such trees as are raised in England is equal to the foreign wood in weight and durability, but its grain is generally coarser.
The outer bark of the fir-tree may be used in the tanning of leather; and it is said that, in the northern parts of Europe, the soft, white, and fibrous inner bark is, in times of scarcity, made into a kind of bread. For this purpose it is dried over a fire, reduced to powder, kneaded with water, and a small portion of corn-flour, into cakes, and baked in an oven. Children in Norway are very fond of the fresh bark, in the spring of the year, either shaved off with a knife, or grated with a rasp.
Common Turpentine is the resinous juice chiefly of the Scots fir, obtained by boring holes into the trunks of the trees, early in spring, and placing vessels beneath for its reception. It is of brown colour; and has a strong odour, and disagreeable taste. In the distillation of turpentine an essential oil is produced, called oil of turpentine, which is extremely pungent. When the distillation is continued to dryness, the substance which remains is known by the name of common resin or rosin; but, if water be mixed with it, while yet fluid, and incorporated by violent agitation, a substance is formed called yellow resin.
Common turpentine is mostly employed as an ingredient in the plasters used by farriers. The oil is occasionally used in medicine; and, lately, it has been considered efficacious in cases of worms. It is much employed by painters for rendering their colours more fluid; as well as in the composition of different kinds of varnish used in floor-cloth, umbrella, and other manufactures. The noxious spirit called gin was formerly flavoured with juniper berries; but as these are now too expensive, oil of turpentine, the taste of which in a slight degree resembles that of juniper, is applied to the same purpose; and considerable quantities of turpentine are thus consumed. The common resin is used in plasters, for which its great adhesiveness renders it peculiarly applicable. It is also of considerable importance in the arts; and musicians rub the bows and strings of violins with it, to take off the greasy particles which are there collected, as well as to counteract the effects of moisture. Yellow resin is used in plasters, and for other purposes in medicine.
Tar is obtained from the roots and refuse parts of the fir-tree, by cutting them into billets, piling these, in a proper manner, in pits or ovens formed for the purpose, covering them partly over, and setting them on fire. During the burning, a black and thick matter, which is the tar, falls to the bottom, and is conducted thence into vessels which are placed to receive it, and from which it is afterwards poured into barrels for sale.
Tar is an article of great utility in manufactures, and for various economical purposes. It is much employed for smearing the rigging, and other external parts of ships, to prevent their receiving injury from moisture. It has been used in medicine both internally and externally; and particularly tar-water, or water impregnated with tar, was, some years ago, a popular remedy in various disorders, but its virtues have been too much extolled. Although considerable quantities of tar are prepared in this country, these are insufficient to supply the demand; consequently we, every year, import great quantities of it from Russia, Sweden, America, and other countries.
Pitch is usually made by melting together coarse hard resin and an equal quantity of tar; or, as some writers state, by boiling tar with a certain portion of water, until it becomes so thick that, on cooling, it forms a hard black mass.
By the ancients pitch was much employed for giving flavour and fragrance to their wines. With us it is of extensive use to mechanics, and in numerous manufactures; but the principal demand for it is in ship-building, to secure the joints and crevices of the planks and timbers, and for other purposes. When mixed with a certain quantity of oil and suet, it is made into shoe-makers' wax; and, in conjunction with whale fat, forms carriage-grease, or the substance with which the wheels of carriages are smeared. The best pitch is imported from Sweden and Norway: and, is of a glossy black colour, perfectly dry, and very brittle.
Lamp-black is a soot formed by burning the dregs and coarser parts of tar in furnaces constructed for that purpose. The smoke is conveyed through tubes into boxes, each covered with linen, in the form of a cone. Upon this linen the soot is deposited: and it is, from time to time, beaten off into the boxes, and afterwards packed in barrels for sale. This substance is employed in printing and dyeing; and has its name from the practice that was formerly adopted of making it by means of lamps.