130 The Philippine Journal of Science i9i8 



successfully run for many months without any trouble if it is 

 properly handled, but it is advisable to empty it for inspection 

 whenever the gas engine is stopped for general cleaning and to 

 overhaul and clean it thoroughly if necessary. Still the necessary 

 work in a producer-gas plant is far less than that required in 

 cleaning the boiler, steam engine, and auxiliaries in a steam 

 plant of similar capacity. 



CONCLUSIONS 



1. The operation of the producer-gas plant at the Bureau of 

 Science is very simple, and almost any solid combustible may be 

 used. So long as the engine is properly lubricated and cooled, 

 the necessary attendance is practically reduced to charging the 

 producer from every one hour to two hours and to cleaning the 

 fire once or twice a day. 



2. The producer-gas plant of the Bureau of Science is very 

 reliable. It has been in daily operation for nearly five years, 

 and since 1914 has been operated continuously for twenty-four 

 hours each day, except for the necessary short stops for clean- 

 ing at intervals of from two weeks to two months. The brick 

 lining of the producer has not been renewed; it has required 

 small repairs only from time to time, and there is no evidence 

 of its being badly deteriorated. 



3. At the Bureau of Science the parallel oper tion of the 50- 

 kilowatt dynamo driven by the producer-gas engine and the two 

 37.5-kilowatt dynamos coupled to the steam engines is very satis- 

 factory. Both the gas and steam engines respond quickly to 

 any change in load. 



4. With the same fuel, the load necessary to generate one kilo- 

 watt hour in the Bureau of Science producer-gas plant is only 

 about a third of that required to produce the same energy in a 

 steam plant of approximately the same capacity. 



5. All the fuels experimented with were satisfactory, but the 

 advantages in regard to minimum attendance of the producer 

 and simplicity of operation are in favor of them in the following 

 order, namely, Batan (Philippine) coal, Hokoku (Japanese) coal, 

 coconut shells, Fushon (Manchurian) coal, Uling (Philippine) 

 coal, copra cake, Chaoco Chwang (Chinese) coal, and Yoshinotani 

 (Japanese) coal. 



6. The results of the tests of coconut shells and husks described 

 in this paper indicate the possibility of using the producer gas 

 or the electric energy derived from it for copra drying and for 

 driving machinery in connection with the copra industry and for 

 extracting husk fibers. 



