The final tin-dip is useful to remove the marks of the brush, and to make the surface uniformly bright. - Andrew Ure

There are only two ores of tin: the peroxide, tin-stone, or Cassiterite; and tin pyrites, sulphide of tin, or Stannine: the former of which alone has been found in sufficient abundance for metallurgical purposes.

The present volume, introductory to a series of works in more ample detail, is submitted to the public as a specimen of the manner in which the author conceives technological subjects should be discussed.

The processes that may be employed, to give to portions of inert matter, precise movements resembling those of organized beings, are innumerable, as they consist of an indefinite number and variety of cords pulleys, toothed-wheels, nails, screws, levers, inclined-planes, as well as agencies of air, water, fire, light, &c., combined in endless modes to produce a desired effect Ingenuity has been long exercised on such combinations, chiefly for public amusement or mystification, without any object of utility.