MANUFACTURE OF MILK POWDER 243 



cistern for dry vacuum system, 12 discharge pipe of pan, 13 pump, 14 pressure 

 gauge, 15 thermometer, 16 sight-glass, 17 regulating valve, 18 two-way draw- 

 off cock for sampling, 19 reservoir, 21 desiccating chamber, 22 spray jet, 

 23 force pump, 24 air pump, 25 compressed air, 26 air drying chamber, 27 air 

 heater, 28 stand-pipe, 29 drip valve, 30 depository of part of powder, 31 outlet 

 of powder, 32 rotary gate, 33 receptacle, 34 rotary dust collector consisting 

 of tubular screen partitions, 35 openings connecting with desiccating chamber, 

 36 head closing tubular screen, 37 springs, 38 gear for rotating dust collector, 

 39 receptacle, 40 screw conveyor removing powder into 41 which is a chute, 

 42 automatic discharge valve, 43 beater to remove adhering powder, 44 spring 

 of beater, 45 rod, 46 toothed rack, 47 driving shaft, 48 suction pump to 

 facilitate removal of powder, 49 conduit, 50 casing inclosing dust collector, 

 51 discharge of casing, 52, 53 and 54 terminal branches, 55 rotary valve, 56 

 auxiliary valve conduit, 57 supplementary valve conduit, 58, 59, 61, 62, 63 and 

 64 equipment for treating either colloids or crystalloids separately. 



"CLAIMS : 



1. "The process of obtaining the solid constituents of liquids 

 and semi-liquids, in the form of powder, which process consists in 

 concentrating the substance by removing a large percentage of the 

 water therefrom, converting the concentrated mass into a fine spray, 

 bringing such spray into a current of dry air or gas having an 

 avidity for moisture so that substantially all the remaining liquid 

 constituents are separated thereby, conveying the dry powder into 

 a suitable collecting space away from the air or gas current, and 

 discharging the air or gas separately from the dry powder. 



2. "The process of obtaining the solid constituents of liquids 

 and semi-liquids, in the form of powder, which process consists in 

 concentrating the substance by removing a large percentage of 

 water therefrom, converting the concentrated mass into a spray, 

 bringing such spray into a current of dry heated air or gas having 

 an avidity for the moisture of the substance treated, retaining the 

 atoms momentarily in said current so that substantially all the re- 

 maining moisture is converted into vapor and the product is pre- 

 vented by the cooling effect of such evaporation from undergoing 

 chemical change, conveying the dry powder into a suitable collecting 

 space away from the vaporizing current, and discharging the air or 

 gas separately from the dry powder. 



"In witness whereof we have hereunto set our hands this 7th 

 day of August, 1906." 



LEWIS C. MERREU,. 

 Witnesses : IRVING S. MERRELI,. 



H. E. CHASE, WIUJAM B. GERE. 



HOWARD P. DENISON." 



