Bulletin . s tliat must be removed by tlie condensing system. * * * [Theminimum volume of permanent gases is governed by the amount of air necessary toproduce complete combustion of the fuel.] 2. Next in hnportunce is sufficient volume for sedimentation, and surface forfriction and coolinu action. * * * it would seem possible to make some reductionin * * * [mist loss], by reducing the velocity of escape, and by the use of greaterfriction surfaces. * * * 3. The temperature of escape should not exceed 15° or 20° C. * * * As acooling agent, water is the best, either as a bath about iron condenser
Bulletin . s tliat must be removed by tlie condensing system. * * * [Theminimum volume of permanent gases is governed by the amount of air necessary toproduce complete combustion of the fuel.] 2. Next in hnportunce is sufficient volume for sedimentation, and surface forfriction and coolinu action. * * * it would seem possible to make some reductionin * * * [mist loss], by reducing the velocity of escape, and by the use of greaterfriction surfaces. * * * 3. The temperature of escape should not exceed 15° or 20° C. * * * As acooling agent, water is the best, either as a bath about iron condensers, or better, asa spray in a current of air, so as to utilize the evaporation of the water. Sprayscoming in contact with the fumes have never been successful, on account of thedifRcultv of separating the iloured quiclvsilver from the water. Air* is the cheapest cooling agent, and the condensers, where not water cooled,should be so constructed as to secure a strong natural circulation of the air Photo No. 62. Condenser Pipes of Johnson-McKay Retorts at Patriquin Mine,Monterey County. 4. Material for construction. There is a fine field for invention in the discoveryof some substance strong enough to be made very thin, a good conductor of heat,which will resist abrasion and the alternate action of heat and cold, without crackingor leakage, and which will resist, at the same time, the action of quicksilver andwarm dilute sulphuric acid. « * * 5. Next must be mentioned the use of an artificial draft. This is all the morenecessary as the cooling of the gases becomes more perfect, and their temperatureapproaches that of the outside air. Auxiliary fire-places and steam-jets * * *are wasteful of power and heat the hill-side flues, putting an effectual stop to furthercondensation. A simple suction fan * * * is the best arrangement. * * *more draft than is necessary to maintain combustion and to protect the men fromsalivation should not be used, as the chimney loss would be
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