TWELFTH ANNUAL REPORT 9X 



pine General Hospital, the Bureau of Science, and the College 

 of Medicine and Surgery, and supplies these institutions with 

 electric current for operating incandescent and arc — including 

 stereopticon — lights; fans; refrigerating machines for the city 

 morgue, for the serum products, ice manufacture, and other 

 purposes of the Bureau of Science, and for the food products 

 of the Philippine General Hospital; air compressors; vacuum 

 pumps ; motors for driving the air and water ventilating and 

 circulating systems, ore crushers, pulverizers and grinders, water 

 pumps, gas scrubbers, centrifuges, and road materials testing 

 apparatus; electric elevators; x-ray apparatus; radiographic 

 apparatus; pantostat; cauterizers; radiometer; keratometer; 

 ozonizers; electric furnaces and incubators; ultra-violet light 

 sterilizing apparatus; liquid-air machine; electric enunciators; 

 induction coils; ultra-violet photomicrographical apparatus; and 

 charging electric ambulances, automobiles, storage batteries, 

 etc. : steam for operating steam tables, urns, boilers and kettles, 

 hot air baths, autoclaves, pumps, engines, automatic stills, hot 

 water tanks, etc. : and gas for student and laboratory burners, 

 gas stoves, gas engines, etc. The installation of the new 75- 

 horsepower Babcock and Wilcox boiler has increased the boiler 

 capacity to 225-horsepower, consisting of one battery of three 

 75-horsepower boilers. 



The abatement of smoke has always been a serious problem 

 when bituminous coal is used in boilers that are designed for 

 high-grade coals. The device now in use in one of our boilers 

 consists of the addition of a Dutch oven with a long furnace roof 

 that attains an exceptionally high temperature, a large com- 

 bustion chamber back of the bridge wall, and horizontal baffles 

 which make a longer passage for the gases before reaching the 

 comparatively low-temperature boiler tubes. This promises 

 to be a satisfactory arrangement for the elimination of smoke. 

 However, there are several problems that must be solved before 

 pronouncing the device a complete success. The slope of the 

 tubes of the Babcock and Wilcox boiler from front to rear is 

 great, and the special bricks, put on and supported by the lowest 

 row, of tubes, slide from time to time, making short-cut passages 

 for the gases which cause the emission of smoke. We shall 

 try to prevent this sliding by using ring tiles which have the 

 additional advantage of more perfectly preventing the early 

 contact of the incompletely burned gases with the comparatively 

 cold lowest row of boiler tubes. 



The original construction of the Babcock and Wilcox boilers 

 has vertical baffles with cleaning holes in one side of the wall. 



