An Historical Sketch of the Origin and Progress of Gas-Lighting

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1832 edition. ... A. The oil spoken of before is obtained by submitting the tar to a simple distillation; by continuing the same process, an additional quantity of essential oil of an inferior quality is produced, whilst the consistence of the tar becomes diminished, and then approaches to a state of pitch. By a further application of heat, and consequent subtraction of an additional quantity of oil, the pitch becomes converted into an asphaltum, which is to be purified in the usual manner. Q. Can bright colours be obtained from ammoniacal liquor?--A. Yes; a most vivid red, orange, and yellow, and shades of those colours may be produced in the art of dyeing by means of the ammoniacal fluid. (E.)