The Tombstone., 1885-07-20
THE FULL AND co MPLETE
 DESCRIPTION.
Of The Mammoth Pumps Which Have Just Been
 Completed.
These Are The largest Pumps or Thelr Kind
 Ever Built,

For many months wagon ioao sIter wagon load of machinery has been passing through our streets on their way to the Grand Central mine, snd 1 from the passing glance 1t received one { would not believe that 1t was an in nense jump and would be the means of making Tombstone one of the frest and wealthiest camps Il the universe. As many of our readers are not aware of the magnitude of these pun ps, and few people aroad who may read this paper, we will give iull description of s,'e pumps, the points of which were obtained from the chief engineer of the mine.
 The main shaft has three compart ments, the two northernlnost being each five feet square and are used for the general operations of the mine, while the south compartment, five by seven feet, Is devoted to the pumps On the north side of the pump com partment IS cage substantially built of steel and used for what Is termed pit work, that is, for lowering pumps. pump rods and such other aupusten- nces as such work entails
 This cage is connected to the pump hoisting engines by 9 steel wire cable ] inch thick, inches wide, 300 feet in length and weighing 1900 pounds. These pump hoissing engines are To- cated in front and few feet to the south of the regular or ore hoisting en- zines and in the same building. They are supported by two parallel walls resting on a foundation of granite laid in cement. The cylinders are sixteen inches in diameter with a 24 inch stroke. The engine shaft is 10 inches in diane CT, carrying pinion 34 ln- ches in diameter, faced with angle gear that engane s'milargear on q spur wheel If feet in diameter, I6 inch face, and weighing l9,710 pounds This spur wheel with brake wheel , feet n diameter, and the cable reel, Is carried on shaft l f inches in diamet- CT. Everything pertaining to this en- zine is built iii the most substantial workmaniike manner, and every ap- pliance provided that would add 10 the security and accuracy of it's lnanipsla tion, among which we may mention a new device for indicating the exact 10 cation of the cage, and brakes on both engines, and reel shafts of such collsss- al proportions and ease of operation that thei: effect is instantaneous.
 But the crowning glory Of the in sti.ution is the Mamoth pumping engine which Is located in a wing on the south side of the main building and erected expressly for its accomo- da,ion. Two thousand tons of uncut stone form the foundation that SUD- port the two parallel walls of neatly finished dimension granite on which rests the splendid machinery.
 $ The engine is compound jet condens ing oyer head beam pasterr, with fly attachment, O'Neil valve motion, and Dickey's automatic unlocking appara- eus, the whole designed and built by hesVhien Iron works of San Frar- isco, expressly for the Grand Central mining conpsny. The base or hollow Ana ssoa is in four pieces. The two
 aFy the front and sides forward of
 sers and on which rest the
 anes, weighing each l4.700
 third piece which forms
 -this base and supports inc
 weighs l6,90O pounds. The