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Show MINING REVIEW. INTER-MOUNTA- IN The Peck Process. centrifugal crushers, the invention of O. B. Peck. These rolls, eight in nura-er on four sets of bearings, are jack-bee- n ted in cast-stecasings or circular Jackets. The outer one of these volves at about 100 revolutions per minute and inner 200. Centrifugal force is exerted to keep the pulp on the rolls until the maxi-thmum fineness is obtained. It is then passed into a long narrow tank, which is traversed by an endless sprocket chain to which a light T rail is attached in such a way as to continually scrape the bottom of the tank, thus keeping the pulp In suspension. The pulp is by various devices agitated in the different tanks and kept in suspen-o- f sion until It reaches the concentrator, where it is cared for as already 5 The Union Hoist. A Peck process concentrator has just erected by W. S. Stratton for the Independence mine at Cripple Creek. as a 400 plant, to use this process, is now being erected at park City, with similar mills projected in other districts, some description of process will be of interest The fol- lowing facts are condensed from a lengthy description of the plant published by the Denver Mining Record: The mill is constructed to use the peck centrifugal process, which, it is claimed, saves a percentage of values considerably in excess of 90 per cent, and will successfully dress all classes ores, owing to the high degree of ad- justability imparted to the mechanism, the process was originally de- signed to operate on tailings or waste resulting from other processes and has successfully done so in Nevada and yet it Is equally adapted to the dressing of crude ores. The name centrifugal suggests vague- ly to the unitiated the character of the I e de-Thou- gh scribed. A radical departure made by the Peck process is that it is preferably intended to manufacture slimes, stead of trying to avoid making them, Centrifugal pumps convey all the wase water from the settling tanks at bottom of the mill to the tank in top of the mill, where it is used over and over reducing to the mfomum the chance of losing values n V16 laundry waste. Te PWr 9 adapted to twice the Present capacity of the mill, conse-pipin- g (luent1y the latter could be doubled without any additional expense for en-tIae9 caPacity at Present is from In-Mont- ana, cylinder is loaded and shuts off automatically the feed, when water is introduced to unload the cylinder. A charge or load varies, according to the character of the ore, from 300 to 500 pounds, and requires from six to twenty minutes time to accumulate. While there is no stoppage of the machinery during the unloading process the momentum is checked by shifting the belt to one of the slower speed pulleys already mentioned. The pulp, after unloading, is passed Into a series of five evaporating or setting tanks, where the surplus water is ran off and jets of live steam intro duced to dry the pulp, after which it is sacked and sent to the smelter for where fuel and water are scarce, and labor is high. These engines will run on either gasoline, kerosene, distillate, benzine or crude oil, and the cost of operation is reduced to the minimum aan by the perfect governing device, which makes the cost only in proportion to the work done. When work is interrupted the engine can be stopped, and work ceases. It only requires a minute to start the engine up again, and It gives its full power at once. f to 250 tons a day avoiding to the The Pioneer Gravel Mining company has four Union engines, one of which ore of Is the dressed. It character has been for the past three aaPted to ores ranging from $5 to $20 years in therunning mine tunnel 1400 feet from uner aa5 PJeeat charges the surface. Four Union engines are also in the mines of the Sterling Mining and Milling company, whose headquarof Governing Speed Engines. ters are in this city. The remarkable economy, reliability At the last meeting of the Leeds Association of Engineers, Mr. Wilson and simplicity of these engines has Hartnell, M. I. Mech. E., read a paper brought them into very general use, on Flywheels and the Governing of hundreds of them having been built. Engines. Perfectly steady governing, The builders of the Union engines r, living on the Pacific coast, being fahe said, was impossible, because a ernor could not act till the speed was miliar with the mining requirements envaried, and even a nearly uniform speed during the past ten years, have encould not be attained without the aid deavored to construct a combined 0f a flywheel. As the usefulness of a gine and hoist that will require very little care and fill all requirements, and flywheel depended upon its stored-u- p their latest effort, as shown in the cut, energy, and its cost chiefly on its is a great success. weight, it was desirable to run its rim These combined hoists are made at the highest practicable speed, say from 1 to power. neyer less than 3000 feet per minute. The most accurate governing had been Campaign Songs. obtained by flywheel power if twenty-fiv- e We have just received from the music strokes or to thirty-fiv- e publishing house of the S. Brainards by correctly designing, fitting Sons company, 151 Wabash Aveof a copy the by the nue, Chicago, and setting the valve-gea- r; free-silvk song-booa greatest care in designing and fitting Silverfor Songs, the campaign of 1896. The the governor and its connections to the book contains solos, duets, mixed and auxilivalve-gea- r, by male quartettes, and is especially arby for campaign clubs. It is not ary power to aid the governor, and in ranged a word edition, and is sold for the compound engine by special setting thecheap low price of 10 cents, remarkably r. could valve-geaGas engines of the or $1 per dozen postpaid. The following be made to run quite as steadily as is the contents of the book: Silver Chimes (male quartette). Silsteam engines. With a flywheel power ver Chimes (mixed quartette). The jolof thirty-fiv- e Impulses, no flywheel ly silver dollar of the dads. I promise American way. The power on the dynamo was necessary. to promise.note.The Well sound for the Some of the best examples of gas en- treasury barber Financial our dimes in pockets. over had to be righted first. gines for driving dynamos shop. The wrong riddle of chinks. England wont forty impulses of flywheel power. By The bank. Its got us! The stocking-le- g the aid of powerful flywheels, special let Sams a Uncle Backbone. bugs. de to attention bucker. designing and great now were tails, the best steam engines some Aspen. Colo., is on the lookout for a governed by a .precision which mining boom, that the oracles of the years ago would have been deemed local press declare is now due. he cone-shape- x- 10-hor- se re-Inasm- uch process, but even after a close inspec- tion of the machinery one who is not an expert mill man is mystified by the startling novelty of the whole affair. On entering the lower floor of the mill a grand array of pulleys, belting, tanks, and machinery is presented. The concentrator proper, which stands near center of the floor is aollow steel, d cylinder, geared by a se- ries of pulleys of varying speed up to 1000 revolutions a minute. The bearings four-inch on are a shaft, most carefully adjusted to an exact equipoise. Inside this cylinder is a sliding cone of the same shape, but a trifle smaller and covered with a wooden jacket which is so nicely adjusted inside the outer cyl- inder as to leave a space of one-siteenth of an inch between the two. The pulp, after having been pulverized to the fineness of an almost impalpable is fed through a pipe with a jet of water into the space between the cylinder and cone, and by reason of centrifugal force coats the inner sur- face of the steel cylinder until the en- tire space is filled or loaded with pulp, the force exerted by the water in the interim driving the waste through t e discharge at the other end. An automatic device indicates when the The accompanying cut is made from a photograph of a power Union engine and hoist combined, as built by the Union Gas Engine company of San Francisco, Cal. This compact and simple power hoist fills a long felt want in the mining districts, el I treatment. The preliminary handling of the grade ore also contains some novel fea- tures. The crude ore, after being dumped from the cart into breakers, is conducted by pipes into possible. gov-flou- 50-hor- se semi-revolutio- ns, er ball-bearing- s; ally |