72 COALFIELDS AND COLLIERIES OF AUSTRALIA. 



The heating value of Collie coal is only about one and a 

 half times that of wood growing in the neighbourhood. The 

 efficiency of Collie coal in stationary boilers is found to be 

 from 8.4 to 10 per cent, lower than that of Newcastle. On 

 locomotives, 100 tons of Newcastle coal was found to be equal 

 to from 142.5 to 170.5 tons of Collie coal. 



