170 Journal of the Asiutic Society of Bengal. [June, 1905. 
Temperature at 5 A.M. hs 1090° 
5-25 ,, 500 1050° 
Muffle turned out at 5-30 p.m. Pieces drawn at 9 a.m. on JO0th 
November, 1904. They had not altered in shape, and showed 
no signs of fusion, ‘They were glazed on the surface, dark brown 
in colour. Were dense and hard, giving a metallic ring when 
struck. The fracture showed the pieces to be solid, not porous 
at all,and was somewhat glassy. The pieces were strong and 
required a sharp blow to break them. 
4, Pyramids were made in the manner previously described, 
containing respectively 5°/, CaCO, and 10°/, CaCO, (19 grams 
clay +1 gram CaCO,, and 18 grams clay + grams CaCO,). They 
were dried at 100°, charged into cold mufile, and muffle ht at 
9-20 a.m., 9th November, 1904. 
99 
Temperature at 1] A.M. ey, 930° 
‘6 IE con) WY 
f TaD 7 9103 
i 12-25 P.M. oe 920° 
99 1 9 930° 
cs 1-30, soo | HO” 
ba es) sce = 940m 
a 3 , be = Om 
BOOM, tome 1oO0R 
is Aaa en soo OU” 
» o 7 se OOK 
cf 5-25, Eee COOR 
Muffle turned out at 5-30 p.m. Pieces drawn at 9 A.M., 
10th November, 1904. 
Identical results were given by both pyramids. They were 
pink, not glazed, of only moderate hardness, easily broken, giving 
a dull fracture. Apparently not strongly enough heated to give 
a satisfactory earthenware. 
The two pyramids were recharged into cold muffle, and 
muffle hit, at 9-10 a.m., 10th November, 1904. The temperatures 
were taken with a thermo-couple (all the previous temperatures 
having been taken in this way) andalso with the Wanner Optical 
pyrometer. The corresponding readings are given below. 
Thermo-couple. Wanner-Pyrometer. 
Temperature at 11 a.m. «.. 1040° oes 
29 11-30 am. ... 970° BE 
9 12 noon are) LOQOT=I GO: 1087° 
Thermo-couple. Wanner-Pyrometer. 
Temperature at 12-30 p.w. ... 1110°-1130° 1132° 
9 1 PM. ... 1090°-1100° 1108° 
” 2-15 p.m. ... 1040°-1050° 1052° 
