ILLUSTRATIONS 



Plate I 



Fig. 1. Vertical and rotary cement kilns and air compressor manufactured 

 in the Bureau of Science. 



2. Perfectly sintered Portland cement clinker made from available 



Philippine raw materials and burned in our experimental kiln. 



3. Perfectly sound Portland cement made from available Philippine 



volcanic tuff. 



TEXT FIGURES 



Fig. 1. Cement furnace, exterior. 



2. Cross section of cement furnace, showing small blocks of the raw 



mixture. 



3. The furnace covered and ready for use. 



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