A series of pyrometric cones for the range 1000-1410 C (cone 05-14) has been developed, mainly from three different indigenous raw materials:(1) 0.1829 Na2 O, (2) 0.1016 K2=O, 0.2289 Al2O3, 1.2142 SiO2 , and (3) 0.7129 CaO, 0.00018 Fe2O3, 0.2915 B2O3 . (For low temperature cones see Abstr. No. 471, Pakistan Sci. Abstr., 1964, 4).