Arizona republican., 1910-09-07
RESUMPTION IF WORK
 Oh CENTRAL AVENUE
Contractor Gregg's New Rock Crush
 CT Placed in Operation Yesterday.

crushing plant of A. W. Gregg. who
 has the contract to supply the rock
 necessary to transform Central ave- 1 nue, from the Arizona canal to the
 city limits, into a boulevard was | placed in operation. By Thursday
 at the latest Mir. Gregg will be full | filling his contract by delivering 100 | cubic yards of crushed granite per 1 day.
 Work upon Central avenue was | suspended June Is, when the supply
 of soft granite at the quarry first | located by MT Gregg was exhausted | Rock too hard to crush was encoun- l tered and a new source of supply had to be found. Exactly what was wanted was discovered just east of Mir. Gregg's old slate quarry. The 1 rock here was found to be much better for road building as it con tained high percentage of lime ana would absorb oil much more deadilv. | What was most important, there was
 an ineXhaustable deposit The haul
 was two miles. the same as before.
 In order to properly quarry. crush
 and handle the rock from the new
 quarry. new machinery was purchas-
 eel by Gregg. His new plant is much
 larger than the old and also less ex-
 pensi,S to operate
 The new machinery consists of a
 horsepower gasoline engine. and an air compressor. The compressor enables one miner to do the same
 work that six did before. with hand
 
 C. C. Sherwood, United States highway engineer, suItrntended the installation of the plant MT Gregg and his foreman. MT Kimball. were In active charge but were advised by MT Sherwood. The labor of install ing alone cost $500. Mining men ,and others who have inspected the plant say that it is as convenient. economical and complete as any they have ever seen. Dwight B. Heard, 1 F.. M. Lamson and Fred Woolsey. | trustees of the Center street road | district. are delighted with it.
 Tn" quarry is so located that ev- | erNthing is most convenient Gravity | Is made to do much of the work. | while at the old granite quarry the | rock mad to be hauled out of a hole | Here the waste is pushed oyer a 1 ledge and falls into d little canyon | below. while the usable rock tumbies | from one set of bins to another without any trouble. When the wa gons are loaded there is a wn-hin | pull all the way to where the rock is needed.
 One mule and one man pull .he rock from the point where it is quar- ried from the face of the mountain to the first bin. which has capac- i ity of about fifty tons. A tramway carries the granite to the bins from which the crIsher is fed. The floors of all the bins are sloping and all | that is necessary to empty them is to open trap doors on the lower side Il A. car runs right under the second II set of bins and gravity carries it II down to the crusher
 In connection with the crusher are Il four sets of revolving screens to separate the rock into the various sizes. These screens, the crusher and the compressor are all operated by II the 32-horsepOwer engine.
 All the machinery and bins which II were at the old quarry have been removed to the new The bin ca pacity is about four times that first installed by Mir. Gregg. Of course all the bins had to be lined Though they were made of boards three or four inches thick. the heavy rock would batter them to pieces in a few days were they not protected inside by iron. For this purpose MT Gregg bought the iron around the piers of the cid railroad bridge at Tempe, II which the Arizona Eastern company sold very cheaply
 The capacity of the bins below the crusher. from which the wagons are loaded. is loo tons. Like the others. they have sloping bottoms and the rock pours right into the wagon beds
 Some who have seen the establish ment have wondered why the crusher was placed so far away from the quarry. It is some little distance | away and around a shoulder from the quarry. This was done to pro tect it from the blasts. which. dis lodge huge rocks that fly many feet into the air and roll down the moun- tain side.
 The man and mule who convey the rock from the quarry to the first bin dc What it took eight men to do at the old quarry. The fact that the quarry is above the plant and gray ity can be utilized in handling the rock is also an enormous saving