92 THE BUREAU OF SCIENCE 



With horizontal baffles, when the boiler is being fired, there is 

 no easy means of removing the soot and dust which accumulate 

 on top of them. In the Heine boilers the removal of the soot 

 and dust from the top of the horizontal baffles is accomplished 

 by special permanent steam connections from the tubes headers, 

 and this arrangement is desirable and would be effective with 

 our present boiler with its horizontal baffles. 



At present, working plans are being prepared for the con- 

 struction of Dutch-oven furnaces in front of the two boilers 

 not yet so equipped. 



With the installation of the producer-gas engine-driven dy- 

 namo, the total rated capacity of the electric generators in the 

 engine room is 125 kilowatts. The most economical operation 

 of any electric generating unit is to operate it at its rated 

 capacity. This has been the aim in our power plant, and in 

 order to get the most evenly distributed load the operating 

 of the refrigerating machinery, the electrically driven feed pump, 

 the electric motor-driven air compressor, and the charging of 

 the electric automobiles of the Philippine General Hospital, 

 respectively, are carried on at the most convenient time. The 

 installation of the steam-driven air compressor makes our system 

 more flexible. The steam-driven air compressor is used when- 

 ever there is high electric load, which one dynamo cannot carry, 

 in addition to the electric motor-driven air compressor. This 

 arrangement avoids the starting of another electric generating 

 unit, which would call for the firing of another boiler, with 

 consequent increase of operating expenses. If the load of the 

 dynamo is not sufficient, then the electric air compressor is 

 operated, which saves the steam which would otherwise be con- 

 sumed by the relatively uneconomical steam air compressor. 

 After office hours, the load on the dynamo usually falls off 

 and the electric automobiles of the Philippine General Hospital 

 are charged until 6.30 p. m., when the load commences to in- 

 crease and is soon high due to the lights in the Hospital. If 

 the arc-light reflectors in the surgical rooms are not needed, 

 or there is no unusual load by 9.00 p. m., the charging of one 

 electric automobile may be begun. At about 10.30 p. m. another 

 electric automobile is connected, and until 7.30 a. m. the dynamo 

 load consists of refrigerating machines, electric automobiles, a 

 few lights, and the electrically driven boiler feed pump. The 

 load distribution of the plant is almost ideal, except the two 

 electric elevators of the Philippine General Hospital which cause 

 peak loads. However, they are intermittent and last only a 



