A supplement to Ures Dictionary of Arts, Manufactures, and Mines, - containing a clear exposition of their principles and practice. (1864) (14779419944)

Identifier: supplementtoures00hunt (find matches)

Title: A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice.

Year: 1864 (1860s)

Authors: Hunt, Robert, 1807-1877

Subjects:

Publisher: New York : Appleton and company

Contributing Library: University of California Libraries

Digitizing Sponsor: Internet Archive

Text Appearing Before Image:

of ditto .... Length of ditto - No. of holes per square inch in sizing sieve 4 feet 2 inches. 12 inches. 14 inches. 108. 100 holes to the square inch. 3,600 ditto 1 ton per pair of stones. About 5 per ditto. 23 per minute. 30 Inches. 108. 3,600. GRINDING AND CRUSHING MACHINERY 585 Character of runner Coarse conglomerate. Ditto bed stone Compact quartz, moderately hard. Duration of runner Average 18 weeks. Ditto bed-stone Ditto 22 ditto. When dressed Every third day. From a series of practical experiments made on the same stuff by these several millsthe following results have been obtained :— No. of Holes persquare inch inSizing Sieve. Quantity of Stutf gi-oiind in 10 hours. Horse Power. Cost ptT ton 1. Horizontal mill 2. Crushing mill - 3. Edge mill 3,6003,6003,600 Cwts.201313 55 7 « d.2 31 76 10 J. D. MackwortlCs Patent Crmhing Rollers, Jigs. 323 and 324, for Coal and other Minerals.These rollers are made conical to equalize the wear, and as one roller travels faster than the 323

Text Appearing After Image:

586 GUANO. other, the fragments are partially turned over, so as to present their weakest line of fractureto the direction of the crushing force. Less power is required to work these rollers. Inlieu of the counterbalance weight usually employed to allow the rollers to separate and passexcessively hard fragments, and to bring the rollers together again, the machine is mademore compact, and simplilied by connecting 2 brass collars, in which the rollers work by anumber of bands or cords of vulcanized india-rubber strongly stretched. A compound cordof india-rubber, 3 inches in diameter, composed of 144 small and separate cords, whenstretched to double its natural length, gives a strain of 3 tons. The brass collars do not revolve. GUANO. This extraordinary excremcntitious deposit of certain sea-fowls, which occursin immense quantities upon some parts of the coasts of Peru, Bolivia, and Africa, has latelybecome an object of great conunereial enterprise, and of intense interest to our agricu

a supplement to ures dictionary of arts manufactures and mines containing a clear exposition of their principles and practice 1864 book illustrations india horse industrial history manufactures images from internet archive

1864

University of California

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