The chemical principles of the metallic arts ; with an account of the principal diseases incident to the different artificers; the means of prevention and cure ; and a concise introduction to the study of chemistry / By W. Richardson.

  • Richardson, William, 1791-1863.
Date:
1790
Catalogue details

Licence: Public Domain Mark

Credit: The chemical principles of the metallic arts ; with an account of the principal diseases incident to the different artificers; the means of prevention and cure ; and a concise introduction to the study of chemistry / By W. Richardson. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    decompofe it, being below the other power of at-» tradtion. The nitrous acid has a power of attrac- tion equal to 2 to overcome, before it can diflodge the vitriolic acid 5 now, the relative attradlion be- tween the viti-iolic acid and the calx offilver, is equal to 4 i which being added to the attraflion of the nitrous acid, for the alkali will produce a power equai to 12, and the change accordingly takes place. Separation or decompofition may be produced by two nnodes. Firft, Via humida, or by the hu- mid Way j which is by folution in one or various menftruai and fecondly, via ficca, or the dry Way; which is the folution of one folid body in another, by fufion or trituration; as in extracting the filver from filver ore, by fufing it with lead; or the ex-? trading of gold from its pre, by triturating it witii quicldilver. Since the principle of eledbive attradion has been difcovered, chemifts have employed themfelves di* ligently, to find out the difi«rent fubftances which attradb each other; and to compare their relative forces. This they did, till fuch a number of in- ftances occurred, that the memory could no longer contain them; in confequence of which, they di- gefted them into tables, which are called tables of eledive attradion,