194 



cox. 



. The relative amounts of fixed carbon and volatile combustible matter 

 vary very little as is shown by the figure. Tlie coals given are repre- 

 sentative of all the Islands and we can assume the average as a fair 

 representation of Philippine coals. ISTot only the amount, but also tlie 

 calorific power of the gaseous portion of these coals is approximately tlie 

 same in all varieties. The following results (Table IV) regarding tlie 

 calorific value of the volatile comliustible matter of coals from tlii.-f 

 Archipelago have been calculated from worlc already published. 



T.\BLE IV. 



Source of t-oal. 



Yield of gas 



per kilo of total 



combustible 



matter — 



In 



liters. 



Calorific 

 value in 

 calories. 



Per 

 cent of 

 vola- 

 tile 

 com- 

 busti- 

 ble 

 matter 

 in the 

 total 

 com- 

 busti- 

 ble 

 matter. 



Yield 

 of gas 

 per kilo 

 of vola- 

 tile 

 com- 

 busti- 

 ble 

 matter. 



Calorific | 

 value of ', 

 the gas 1 

 produced 

 per kilo 

 of vola- 

 tile com- 

 bustible 

 matterin 

 calories. 



Batan Island 



Cebu 



Negros 



Zamboanga _ 

 Polillo 



335 

 307 

 297 

 309 

 333 



1.4 -ID" 

 1.5-105 

 1.6-10« 

 1. 8 •100 

 1.9-10" 



50.45 



51.45 



51.1 



45.4 



46.6 



665 

 597 

 581 



680 

 714 



2. 8-1 06 

 3.0-10« 

 3.1 -lO" 

 3.8-W 

 4. -W 



The numbers representing the calorific value of the gas produced 

 per kilo of combustible matter and also of volatile combustible matter 

 in calories are nearljf, though not absolutely, eonstant.'^^ The coals 

 from the Military Eeservation in Batan Island, from Polillo, and from 

 the Compostela region in Cebu have a somewhat higher value, while 

 that for all others thus far investigated is practically constant. The 

 samples are arranged in the order of the slightly increasing value of 

 the calorific power, and it will be seen from Table IV that the numbers 

 representing the percTentage of volatile combustible matter arrange them- 

 selves almost in the reverse order. 



I have calculated the values of "a" in Philippine coals from the 

 proximate analyses and determined calorific values given in Table II 

 and using as the calorific jjower of the fixed carbon the value SIX the 

 percentage, the results are as follows : 



°' The gas from Australian coal has a somewliat liij;lier calorific value than 

 any of the above. 



