Bisbee daily review., 1918-07-28

about Ine consistency OL lne DS0b NSin ent
 As the name indicates, the mills are operated by means of heavy revolving steel balls which reduce the coal to the desired fineness. As the dust arises from the bottom of the mill ii passes through a blower fan contained within the casing, which forces 1t against a screen, any particles too coarse falling to the bottom of the mill to be further reduced.
 In Use
 As was stated in the section descrip- tive of the reverberatory furnaces, the powdered fuel is blown from the mills to bins and from these it passes by screw conveyOrs of variable speed either to the reverberatories or to the two single boilers which are thus fired The principle of combustion in the fireboxes of the boilers is precisely the same as in the Teverberator1es- the fuel is fed at predetermined speed into a mixing pipe where it receives the necessary amount of air and Is then blown into the fireboX where com bustion takes place precisely as in the furnaces, the small amount of ash re- maining being carried to the stack.
 Power House
 The power house equipment IS, nat urally. complete in every detail and the house itself has been arranged so as to permit the installation of addi- ticnal engine and dynamo units as the same may be required.
 For the converteFs, there are provld- ed two 1S,000 cubic foot blowing en- zines and for the blast furnace two 400 it. Root type blowers.
 All drives throughout the plant are electric and the dynamo installation IS correspondingly extensive. The gen erating equipment consists of enc Allls Chalmers turbo-generatOr set, the dy- namo direct connected to steam tur- bine. with a rated capacity of l5OO kilowats, and one General Electric set of the same general description with an output of 1000 k. w., the generating voltage in both cases being 2ZOO- These units furnish all the electric power required about the plant.
 Direct current for the electric loco motives. cranes and other machinery requiring it is. furnished from a Gener- al Electric 200 k W. motor generator set.
 In this connection it may be stated that all haulage about the plant proper is electric and all machines in the machine shop are direct motor driven Naturally. innumerable small motors are used everywhere about the plant which affords one of the most com plete examples of the use of electric mower that can be found ill the south west.
 Waste Gases
 All waste gases from rOasters, lur- naces. etc, are discharged through dust chambers into the huge stack which stands high above the plant on a small hill and which is one or the most striking features of the valley scenery. This stack is of brick, 42J feet in height. 30 feet in diameter at the bottom and with a graceful taper to 25 feet at the top.
 The furnace gases reach the stack through a main flue 2OX25 feet in size and with a length of 1000 feet. lt may be mentioned that the birds-eye view of the plant printed herewith was talk en from a platform about 100 feet from the bottom of the stack. The great main flue may be seen very plain ly in this cut.
 The plant is provided with a magni- ficent machine, forge and plate shop equipped with every possible conven- fence for the making and repairing oi every part of the smelter equipment I.athes, drill presses, shears and all inc other machine tools necessary TOT the self contained operation ol the great plant are provided most liberally and every machine in the shops IS d. rect motcr-driven and of the latest and most improved type and design
 The warehouses are spacious ana sturdy buildings and will furnish am ple storage room for the ten thousand and enc things that must be kept on hand in a plant Of this magnitude.
 Adequate provision is made for tine housing of the electric locomotives and other parts of the rolling equip ment of the plant.
 Water Supply
 One of the first cares of the ensi- neers was the securing of an adequate supply of pure water and the problem was solved by the drilling of two wells 10 a depth of l250 feet In both ol these wells an ample flow of water oi exceptional purity was developed and' in this vital factor of operation, the plant is assured of an unlaiiing supply
 At the present time the pumps are delivering 25O gallons per minute TO the 300. 900 gallon tank that has been erected at the rear of the great stack from which tank it flows by gravity 10 the points required.
 Cooling Ponds
 One Of the first things that strike the eye of the, visitor as he enters the grounds is the cooling tank where the water from the jacket of the blast TUT mace is lowered to usable temperature The water flows from the jacket Co system of spray nozzlcs discharglng into a concrete pond 70Xi20 feet m size. From the noZzles the spray ris es Co a height of several feet and the water is cooled to close tO air temper lture by the time it comes Co rest in the pond 10 be pumped back to the furnace and used again.
 A second and larger pond, lS5x160