Bisbee daily review., 1911-08-27

overload. The equipment includes four Allison-Chalmers type E. 4-cylinder triple expansion engines oi 1750 kw. each. High pressure and one low pressure cylinder on enc side, inter- mediate pressure and one low press ure on the other side. Engines run ming 100 r. p. m.; steam pressure, 175 lbs. superheat between 50 and 75 deg; size of cylinders, h. D., 2sx4S inches; i. D., 52x4S; l. D., 54x4S. Al berger surface condensers, two on each engine on account of low press ure cylinder, one for each side. These are the largest engines of the kind, though there are many larger of the cross compound type. The lywheel is of four parts, weighs 55 tons, and is 26 feet in diameter, of steel, with rim speed of S.I63 feet per minute. or. at this rate, it would roll more than a mile and a half per minute. Each engine generates about 5000 horse power, and when it is stated that the ordinary passenger locomotive run ming 60 miles an hour uses about I70O horsepower, the size of these en- zines may be better understood. The engines each operates an alternating current generator. Diameter of the rotar over all is % feet When I wis ited the plant the engine operating was pulling a 50 per cent overload without trouble.
 There are two Nordberg tandem compound exciter engines; cylinders, 13-23x36; 100 r. p. m.
 One Allis-Chalmers generator set.
 One Nordberg triple expansion high duty pumping engine; cylinders, 12 24x36; capacity, 1O.00O,OOO gallons per 24 hours. The water is in part fsst used for the condensers in the power plant, and then over a set of cooling towers. The big pump takes it from the basin under the towers, pumping into the S,0OO,0OO gallon reservoir which supplies the mill There are three cooling towers of Bay Consoli- dated design, and several more are to be built.
 One Nordberg cross compound, pis- ton blowing engine, 5000 on feet ca pacity.
 Fourteen Heine boilers, 513 B h. p. each, equipped with Foster superheat- CTS.
 Four Blake compound boiler feed pumps.
 Three Foster feed water heaters.
 The main and auxiliary headers and all valves and fittings are steel. The plant will develop largely in ex- cess of stated capacity, and in fact when everything is running smoothly and to full capacity there will doubt less be an idle engine, ready for emergencies.
 The machine shop equipment at the Hayden plant is exceptionally good It includes four lathes, milling ma chine, planer, shaper, two drill press es, three pipe machines, two bolt cut ters, grinder, two additional lathes and a boring machine and a press are en route to be soon installed. The blacksmith and boiler shop is also furnished with every appliance needed. The carpenter shop is close by and equipped with necessities. In fact, no detail of this end of the business has been overlooked.
 lt is a little unfortunate that mill Hs pidCtlCc mas been DfCusGL 10 Sucn perfection, because it is now the common thing to find a complete mill almost exactly like all the others. The mill at the Ray Consolidated at Hayden is as handsome a structure as l have ever seen, and the machin- cry is the very best. The fact that the concentration is 20 to proves efficiency. The whole planning of this mill was so correct that praeti- cally no changes have been made, and the building itself was exactly what was needed. The construction of ad- ditional units goes on with the regu- lar operation Of those in commission. This mill building and the first units were put in commission in record time. And when, within a few months. the entire plant shall be in operation. with 10000 tons of ore going through daily. there will certainly be a con centrator worthy of more than cursory attention. G. O. Bradley was the Ge- signing engineer.