A N T I M O N Y : ITS HISTORY, CHEMISTRY, MINERALOGY ...

74 THE MKTALLtJRGY OF ANTIMONY.
The charge for each tuho is 5 cwts. of ore; three hours are required
for complete liquation; the yield is only 50 per cent, of the sulphide
FIG. 7.
FIG. 8.
content; CA owte. of coal are used for the production of 100 cwts.
of tlno Hiilpludo ; tlio tuhoH la.st twenty days each.
Tho conk of producing TOO kilos, of sulphide in tube furnaces is:—
Uboiir . . . . 1-53 fr. ( = 7*4d. porewt.)
Kuol . . . . 1'28 fr. ( = 6d. „ )