Restraints, either by prohibitions, or by taxes, upon the exportation of goods which are partially, but not completely manufactured, are not peculiar to the manufacture of leather. As long as anything remains to be done, in order to fit any commodity for immediate use and consumption, our manufacturers think that they themselves ought to have the doing of it. Woollen yarn and worsted are prohibited to be exported, under the same penalties as wool even white cloths we subject to a duty upon exportation; and our dyers have so far obtained a monopoly against our clothiers. Our clothiers would probably have been able to defend themselves against it; but it happens that the greater part of our principal clothiers are themselves likewise dyers. Watch-cases, clock-cases, and dial-plates for clocks and watches, have been prohibited to be exported. Our clock-makers and watch-makers are, it seems, unwilling that the price of this sort of workmanship should be raised upon them by the competition of foreigners.
By some old statutes of Edward III, Henry VIII. and Edward VI. the exportation of all metals was prohibited. Lead and tin were alone excepted, probably on account of the great abundance of those metals; in the exportation of which a considerable part of the trade of the kingdom in those days consisted. For the encouragement of the mining trade, the 5th of William and Mary, chap.17, exempted from this prohibition iron, copper, and mundic metal made from British ore. The exportation of all sorts of copper bars, foreign as well as British, was afterwards permitted by the 9th and 10th of William III. chap 26. The exportation of unmanufactured brass, of what is called gun-metal, bell-metal, and shroff metal, still continues to be prohibited. Brass manufactures of all sorts may be exported duty free.
The exportation of the materials of manufacture, where it is not altogether prohibited, is, in many cases, subjected to considerable duties.