Arizona silver belt., 1893-11-18
4 Nrw mor,nlasr corrnn lnNA,n.
lColnmnnioatnd.A

I {Commnnioatedl An improvement recently placed oi f the water jacket furnaces of The Ol, Dominion Copper oo., at Globe, con
 sists of an arrangement fo5' ileating tho blast before it enters the furnace. ana , as 1t has been 50 eminently successful , in its work l shall describe it in detail, first giving tLe construction, and af
 forwards showing what effect it has
 had on the working of the furnaces,
 and in what ways it has effected say-
 ing of time and reduction of the run
 ming expenses.
 The improvement is of the simplest
 kind, consisting of a wind jacket com
 pletely surrounding the cruoible ofthe
 furnace, and being in connection with
 the blast supply pipe and also with the
 regular wiad-box. In operation the
 blast coming from the supply pipe en- ters the wind jacket in the usual cool
 condition, slightly higher than the surrounding atmosphere, aud passos
 completely around the cruoible, here coming in contact throughout it's pas
 sage with the hottest portion of the
 furnace. After making the circuit of
 the crucible it flows into the regular
 wind-box, and thence to the tuyeres in the regular fashion.
 In making this passage it serves sey- eral purposes:
 lst. It heats the blast to high de gree, by taking up the heat which has formerly been lost to such large ex- tent by radiation, now taking it back into the furnace to perform useful work by reducing the ccISo cohsump- gion.
 End. IL keeps the cracible from get ting ahnormaily hot, thereby saving wear and tear caused by great varia. tions of temperatare, and saving the l time which was formerly lost in cool ing it down when it got in this highly | heated condition.
 3rd Making it very much cooler and more comfortable for those work ing in the vicinity of the furnace.
 When one of these now wind jackets was first placed in operation by this Company they ran comparative test of this furnace and one which was ex- acsly similar except that 1t had not the wind jacket, both being 42 inch fur. naces Of the ordinary type. The ta.t was very successful and showed that tho jacket effected saving of 5 10 | of coke in every chwsa of GJ0 lbs. oi ere, In this furnace tho temperature of the blast is raised 5J as has been determined by many readings ta.ssn just before entering and leaving the jacket
 A jacket was shortly Afterwards placed around the cgueible Of 8 second | 'araace, and by slightly modifying lhe lesigu it has heep made even more successful than the first one, as the | of the blast in this case is 'aised 6S.5' in it's passage, and te furnace is now running on one pound es5 coke per charge than the first one. 'r six pounds less with the jacket than without As stated above there is in 'raased economy by saving the tlme which was formerly lost by having to 'ool down the cruciD,e when itbecame ibnormally hot, thereby allowing nore ore to be smclted at the same .o55 for abor and fixed cliargas.
 The Old Dominion Copper Go. are ION using two of these jackets, one of which has been in use for two months md they are now putting one on their hird furnace, 50 well are they pleased g,th #.
 The wind jacket is the Invention of .lr. Louis B. Walker and Mr John aarphs5 who have applied for letters 'atent on it. and hope to get it estab- lshed in some Of tlre other snelGng lants of Arizona, as they consider hal the high price Of coke in tho Ter itory vii demand its adoption.