Vol, I, as 6.] Note on Bundelkhand Gneiss, 169 
LN. 8.] 
The clay was tested for its — of forming a china or 
earthenware in the following man 
1, About 20 grams of the ay a was mixed with sufficient 
water to give a plastic clay, which was moulded into the form of a 
a. pyramid. nes s was dried at 100°, then baked for 34 
hou a gas mufile, at a temperature of 890°. The resulting 
ss pink in siti easily broken, possessed little cohesion, 
was soft and friable. 
m carbonate (is 6 grams clay, ‘4 s CaC This was 
moistened, kneaded, and the resulting plastic clay formed into a 
pyramid as before. This was dried and h d in a blast 
(made from clay alone). Pyramids charged into cold muffle and 
muffle lit at 9-10 a.m., on 8th November, 1904, 
_ Temper ature at 11- pa A.M. ey 1155° 
” ae 940° 
= ” 19.90 be ee 
5 P.M, = 1300° 
Heating was then discontinued as one of the pyramids was 
seen to be sinking, the result of incipient fusion. The mu 
turned at t yramids drawn at 2-15 p.m., and poke 
ne.—Pyramid had sunk considerably. Was smooth, 
glazed dirty brown on the side cture was highly 
a, the clay would not be of any use as earthenware. 
,|° CaCO,;—The surface of the al was 
mixed with 2,/°CaCO, is more fusible than the clay alone. The 
colour of the exterior was dark brown. A fracture showed a 
preas, eee layer under the surface, ae a more compact, blue- 
black ce “au — Useless as earthen 
arth was made into a lake sls as before, without 
any Pickin (except water) and formed into a p and a 
Small dish, These were dried at 100°, charged into cold bern 
and mufile lit at 9-15 a.m., on 9th November, 1 1904, 
Temperature at 11 a.m ve 1030° 
11-30 ape 930) 
: : 1050° 
” 11-50 ,, -* 060° 
” 12-25 Poa . eee 1 
” ae son “ 
7 1-30 ” ove 1130" 
2-15 ces 980) 
: ee 2 DOP 
# 1130° 
