112 The Philippine Journal of Science isis 



The purge valve should be opened, and the gas throttle of the engine 

 should be closed. Immediately after this operation the motor that drives 

 the auxiliary cleaning machinery should be stopped, the three-way cock 

 in the discharge pipe of the producer left in communication with the 

 chimney, and all water supply stopped. The valve for admitting air in 

 the ash pit should be entirely closed, if the producer is to stand idle less 

 than sixteen hours; otherwise the air intake must be regulated to give 

 just sufficient draft to keep the fire alive. All these manipulations should 

 be performed as quickly as possible, so there is time to return to the gas 

 engine before it slows down too much. The engine should be stopped at 

 the right position for starting. This can be easily done with practice. 



RECORDS OF TESTS 



The tests were made under actual running conditions without 

 interfering with the regular supply of light and power. The 

 results obtained have been duplicated day after day in ordinary 

 practice. No special preparations were made to obtain excep- 

 tionally high records, because we believe that a plant should be 

 judged on what it can ordinarily perform rather than on what 

 it can perform under the most favorable conditions. 



Fuel u^ed. — The fuels used were Batan and Fushon coals; 

 the former is black lignite mined in the Philippines, and the 

 latter is Manchurian bituminous coal. The analyses of these 

 fuels are shown in Table I. 



Table I. — Analyses of Batan and Fushon. coal." 



Batan coal : Per cent. 



Moisture 14.63 



Volatile combustible matter 39.09 



Fixed carbon 38.73 



Ash 7.55 



Total 



100.00 



Total calories 



5,150 



Available calories 



4,753 



Fushon coal: 





Moisture 



4.66 



Volatile combustible matter 



39.94 



Fixed carbon 



48.01 



Ash 



7.40 



Total 



100.00 



Sulphur (separately determined) 0.89 



Coking quality semicoking 



Color of ash ' grayish white 



Total calories 7,133 



Available calories 6,633 



" Analyzed by A. S. Arguelles, inorganic chemist, Bureau of Science. 



