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Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve ...

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Excerpt from A Manual of Practical AssayingFire-assay determinations involve the separation of the metal sought from the other constituents of the ore by the aid of heat and suitable ¿uxes, and its estimation by weighing in a state of purity. For example, if the object is the determina tion of lead in an ore, the ore is mixed in a crucible with suit able ¿uxes and fused. The lead is reduced to the metallic state, in which condition it is readi...

Excerpt from A Manual of Practical AssayingFire-assay determinations involve the separation of the metal sought from the other constituents of the ore by the aid of heat and suitable ¿uxes, and its estimation by weighing in a state of purity. For example, if the object is the determina tion of lead in an ore, the ore is mixed in a crucible with suit able ¿uxes and fused. The lead is reduced to the metallic state, in which condition it is readi...

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Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.