The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . w, whilethe heavier particles and clean water are dischargedbelow. ORE-CONCENTRA TING MA CHINERY. 273 Another form of separator is known as the Calumetclassifier, and consists of a trough having four or five de-pressions along the bottom. The water and sand undergosuccessive washings in each depression as they pass are used to guard the depressions, Mhich retain theheavier particles. This form is said to use very little wateras wmpared with other separators. In a general
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . w, whilethe heavier particles and clean water are dischargedbelow. ORE-CONCENTRA TING MA CHINERY. 273 Another form of separator is known as the Calumetclassifier, and consists of a trough having four or five de-pressions along the bottom. The water and sand undergosuccessive washings in each depression as they pass are used to guard the depressions, Mhich retain theheavier particles. This form is said to use very little wateras wmpared with other separators. In a general concentrating plant separate settling-boxesare used to divide the slimes for dressing or fine concen-tration, but in a distinctively fine concentration mill theore is at once reduced to pulp for treatment. In this casebuddies and tables of different types are used where theproduct is of various grades, some requiring further treat-ment, but for clean concentration the Frue vanner is uni-versally used. Where gold and silver are the metalssought the ore requires fine crushing, and the same is true Fig. THE FRUE VANXrXG MACHINE. in a less degree of lead, copper, and tin ores. For such,stamps and Frue vanuers are the regulation outfit, thevanners producing a cleaner mineral than other slime- 274 WONDERS OF MODERN MECHANISM. dressing machines, with exceptionally lo\\ loss. They alsohave the advantage of immediate automatic treatment ofthe pulp without sizing, at one operation, and without anyrehandling. They require a minimum of power, water,and atteudauee. The Frue vanner has an endless rubber belt presenting atop surface twelve feet long and four feet wide, supportedby rollers so as to form an inclined plane bounded on thesides by rubber flanges. By means of a drum the belt isgiven an upward travel along the incline, and at the sametime receives a regular shaking or settling motion from acrank-shaft runnino- alono; one side at right ano-les to thetravel of the belt. At the
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