The chemical pocket-book, or memoranda chemica; arranged in a compendium of chemistry ... with Bergman's table of single elective attractions / as improved by Dr. G. Pearson.

  • Parkinson, James, 1755-1824
Date:
1807
Catalogue details

Licence: Public Domain Mark

Credit: The chemical pocket-book, or memoranda chemica; arranged in a compendium of chemistry ... with Bergman's table of single elective attractions / as improved by Dr. G. Pearson. Source: Wellcome Collection.

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    the elasticity of the contents be greater, the fluid will be either sustained in the tube, or driven into the bell-shaped vessel; and it the force be strong enough, the gaseous matter will pass through the fluid, and in part escape. Thus is formed the pneuivi atochemical apparatus. By reversing the frame- work, removing that piece to which the neck of the retort was suspended, and shortening the glass chimney of the lamp, the apparatus is rendered fit to perform evaporation or saline fu- sion, a capsule of glass, platina, Sec. being placed on the ring instead of the retort: or, a triangle of iron being placed on the ring, a small crucible may be substituted. The tablet in the lower compartment of the plate exhibits the characters employed by Hassenfratz and Adet, for the symbolical expression of the subjects of chemistry, and of their affinities and composition. The lirst character, in the first column, denotes LiGHt; the one beneath it caloric, to which succeed oxygen and nitrogen. These four are simple substances, which may exist in a gaseous slate at the ordinary state of the atmo- sphere. The next denotes fixed alkali, which, by the cen- tral insertion of the initial letter, serves to denote pot-ash, soda, See. The last character in this column is that of simple earths, which by the initial letter is made to denote lime, silica, or any other simple earth. The four first characters in the second column denote simple combustible substances, commonly called inflammable, in this order, carbon, hydrogen, sulphur, phosphorus.— The next character is a circle denoting metals, a point in the centre denoting gold, and the initial letter placed in the same manner distinguishing all the others. The next character, a square, denotes radical acidijiable compounds, whose bases are but little known, such as the muriatic, boracic, &c. the particular radical being marked by descriptive letters in the centre. The first character of the third column, a lozenge, denotes •rortain compound substances not having acidijiable bases,