The three ingredients are now ground separately to a very fine powder. The mills which effect this, and incorporate, are so similar, that a description will be given under the head of “Incorporation.” Screening.After being ground in this way, the saltpetre is passed through a slope cylindrical reel, covered with copper sieving wire of 60 meshes to the inch, which, as it revolves, sifts it to the required fineness, being then received in a box or bin underneath. The charcoal and sulphur are likewise passed through similar reels of 32 and 60-mesh wire respectively, and that which remains without passing through, is ground again under the runners.
- Author
- The Project Gutenberg EBook of Class Book for The School of Musketry Hythe, by E. C. Wilford Published 1861
- Posted on
- Saturday 7 March 2020
- Dimensions
- 600*469
- Tags
- Century:19th, Manufacturing, Weapons
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