The Guide to Useful Knowledge, in the Form of a Catechism

The Guide to Useful Knowledge, in the Form of a Catechism

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1844 edition. Excerpt: ... COMPOUND GUMS, &c. Q. What is sulphur? A. Sulphur, or brimstone, is a yellow substance found in the earth, chiefly in volcanic countries, and combined with various minerals. We import it chiefly from Italy and Sicily. It is extensively used both in medicine and the arts, and is one of the ingredients of gunpowder. It burns with a pale blue flame, emitting at the same time a suffocating effluvia. Q What is oil of vitriol? A. An acid, called sulphuric acid, made by burning sulphur, in leaden chambers filled with oxygen gas. It is thus prepared in large quantities, for the use of bleachers and other manufacturers. Q. What is the substance called blue vitriol? A. Blue vitriol, blue copperas, or sulphate of copper, is a salt of a blue colour, produced by the union of copper with sulphuric acid. This salt i9 often naturally formed, but more often obtained by an evaporation of the water, which runs through copper mines. In this country, it is obtained by exposing the sulphuret of copper to heat, air, and water. Q. What are some of the uses to which blue vitriol is applied? A. It is used in dyeing, and is an ingredient in the composition of black colours. Tea urns, fowling pieces, &c. are browned by being washed with a preparation of it. In medicine, it is serviceable for its astringent and emetic properties, and it is also employed for healing ulcers. Q. What is white vitriol? A. White vitriol, white copperas, or sulphate of zinc, is a whitish yellowish salt, which consists of a combination of zinc and sulphuric acid. This salt is sometimes found in a natural state, being apparently formed by a decomposition of blende (zinc united with sulphur). Q. Is not white vitriol artificially prepared from blende? A. Yes. This manufacture is chiefly...show more

Product details

  • Paperback | 42 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236526678
  • 9781236526670