The Edinburgh new dispensatory ... Illustrated and explained in the language and according to the principles of modern chemistry. With ... tables and several copper-plates, explaining the new system of chemical characters.

  • Duncan, Andrew, Jun., 1773-1832.
Date:
1803
Catalogue details

Licence: Public Domain Mark

Credit: The Edinburgh new dispensatory ... Illustrated and explained in the language and according to the principles of modern chemistry. With ... tables and several copper-plates, explaining the new system of chemical characters. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

    27/734 (page 9)
    Galvanism. 80. The phenomena of galvanifm feem to depend folely on th*5 agency of ele&ricity, excited during certain chemical a&ions, 81. The galvanic fluid is excited by arranging at leaft three heterogeneous bodies; for inftance, two metals and a fluid, in fuch a manner that the two metals be in direct contadft with each other in one part, and have the fluid iiiterpofed between them in an- other. 82. The pile of Volta, by which it is rendered moft manifeft, is conftru£ted, by combining a feries of Ample galvanic arcs (81 ) into one continuous circle, in one uniform order of arrangement. 83. The foixds capable of exciting galvanifm, are the metals and charcoal ; and the moft efficient fluids are certain faiine folu- tions. 84. The effe&s of the Ample galvanic circle (81.) on the ani- mal body, are the produ&ion of a fenfation of light when applied to the eye ; of an acid tafte on the tongue; and the excitement of the mufcles through the medium of the nerves. 85. The pile, when well conftru&ed, befldes thefe effe.&s, %lfo gives a fliock and fpark refembling thofe of ele&ricity (72.),*and proves, that the galvanic action is always accompanied by the- decompolition of the fluid, and a combination of one of its com ftituents with one of the metals. Magnetism. 86. If an oblong piece of iron be fiifpended freely, it will af- fume a determinate pofltion with regard to the axis of the earth. 87. When the fame end always; points in the fame direction, it is faid to poffefs polarity, or to be a magnet. 88. The fimilar poles of two magnets repel each other; and the diffimilar poles attract each other yvitb. a force decreaflng as the dillances increafe. 89. Any piece of iron, when in the neighbourhood of a mag«. net, is a magnet; and its polarity is fo difpofed, that the magnet and iron mutually attract each other. 90. Magnetifm does not feem to affedt fenfibility or irritability* or to influence chemical action. 9 Salifiable Bases^ 91 - The great bulk of this globe conflfts of earths and ftones. Although thefe vary infinitely in their external character and phyfical properties, they are found to confift of a very few fub- ftances, mixed together in different proportions, and modified by external agents. Q2. Thefe