313240214-Elements-of-Chemistry-Lavoisier_0148.pdf - The Project Gutenberg eBook of Elements of Chemistry by Mr Lavoisier The most usual method of

313240214-Elements-of-Chemistry-Lavoisier_0148.pdf - The...

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08/08/2015 The Project Gutenberg eBook of Elements of Chemistry, by Mr Lavoisier. 148/229 The most usual method of levigation is by means of a flat table ABCD, Pl. 1. Fig. 7. of porphyry, or other stone of similar hardness, upon which the substance to be reduced to powder is spread, and is then bruised and rubbed by a muller M, of the same hard materials, the bottom of which is made a small portion of a large sphere; and, as the muller tends continually to drive the substances towards the sides of the table, a thin flexible knife, or spatula of iron, horn, wood, or ivory, is used for bringing them back to the middle of the stone. In large works, this operation is performed by means of large rollers of hard stone, which turn upon each other, either horizontally, in the way of corn­mills, or by one vertical roller turning upon a flat stone. In the above operations, it is often requisite to moisten the substances a little, to prevent the fine powder from flying off.
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  • Summer '20
  • Sect., pl., Mr Lavoisier, muller  M

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