MYSORE, CANARA, AND MALABAR 
149 
In making red glass the Loha is left out. Forty-four crucibles CHAPTER 
stand in one furnace. A small quantity of the materials is assayed 
in the furnace used for blowing the glass ; and, if the soda prevails June 9. 
too much, an addition is made to the quartz. 
In order to vitrify these materials, burn on the first day ten 
bundles of firewood. Next day put out the fire by stopping the air. 
Next day put in fresh wood, and keep up the fire for eight days ; 
but no supply of fewel is given at night. The fire of course goes 
out towards morning. Afterwards the fire must be kept up night 
and day, till the glass be melted ; which is known by putting an 
iron rod into the crucible through the small hole (e) in the flat 
stone. This requires from four to six days more. The fire at first 
is put out with a view of preventing, by this means, the glass from 
being injured by the smoke: but it is not easy to conceive any 
chemical operation more injudiciously conducted than this is. The 
alkali is never saturated, and effloresces from the glass, when that 
is kept any length of time. Each crucible ought to produce 41 lb. 
3 oz. 4 dr. 2 scr. 8 gr. of glass, worth seven Sultany Fanams ox \s. 8 \d 9 
The contents of one crucible for black glass, are 
lb. 
oz. 
Quartz 
- 
- 
- 
14 
9 
Soda 
- 
t 
- 
29 
6 
Broken glass 
- 
- 
- 
22 
1 
lb. fib 4 4 
In eight or nine days this is vitrified by a fire burning constantly, 
and produces about 44^ lb. worth 4§ Fanams , or a little more than 
three shillings. 
The ornamental rings are made as follows (see Fig. 14) : A 
circular cavity (a), about two feet and a half in diameter, is dug in 
the floor of the work-shop (b b), and is covered by a flat dome of 
baked clay (c c). In this are four perforations, one of which cannot 
be seen in the sketch, as it is a section. By one of these the fewel, 
which is charcoal, is introduced by an inclined plane (d). The 
