ILLUSTRATIONS 
TEIXT FIGURES 
Fig. 1. Map of the Lubang Islands. Traced from a Coast and Geodetic 
Survey chart. 
2. Elevation of the experimental glass furnace. Section through 
ABCD; a, chimney, made of galvanized or plain sheet iron Me 
inch thick. Dimensions are given in centimeters. 
3. Plan of the experimental glass furnace. Dimensions are given in 
centimeters. 
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