140 Arran Baryto-Sulphate Pigment. 
mising that the manufacture has now extended to sonie other 
places, and has assumed importance, as the conversion of a 
substance, hitherto considered as almost useless, into a pro- 
duct of considerable value. 
The works now to be described are about half a mile from 
the shore in Glen Sannox, within three or four hundred yards 
of several considerable veins of a very pure Sulphate of Ba- 
ryta, traversing the granite of Goatfell. The veins, which 
seem to be those discovered long ago by Professor Jameson, 
cross the impetuous mountain torrent that collects the waters 
of this wild glen; and two of them have been wrought on both 
sides of the stream. ‘Two open cuts have been made on the 
north side of the torrent, and wrought to the depth of 16 feet. 
The veins on that side seem to decrease in width as they re- 
cede from the stream ; but, on the south side, they appear to 
widen, and are now worked by means of a short adit, and a 
shaft, which at present is 25 feet deep. This shaft is kept 
dry by a pump, wrought by a small water-wheel, moved by 
one of the numerous streams that rush down the rocky sides 
of the glen. There are two principal veins, about 20 yards 
asunder. The direction of the most western is from N.NE. 
to S.SW.; the eastern runs from N. by E. to S, by W.; and 
both possibly may be branches of one great vein. They are 
nearly vertical where now opened. 
From these veins a large quantity of a very pure, crystal- 
line, translucent sulphate is extracted. Some masses have a 
slight brownish tint. It-is the straight lamellar variety, and, 
for purity, exceeds greatly the spar employed in the Ayrshire 
and Welsh manufactories of Baryto-Sulphate pigments. 
The works for preparing the paint are very well constructed. 
All the machinery is moved by an overshot water-wheel, 
26 feet in diameter and 6 feet wide, The spar is first sorted 
and washed. It is so brittle that it is easily broken into small 
pieces, when it is washed with warm diluted sulphuric acid to 
remove any colouring matter ; and it is afterwards crushed to 
powder by a pair of granite stones hooped with cast-iron, and 
revolving on their edges in a well-made circular trough 
hewn granite. These stones weigh five tons. 
The powder thus produced is introduced into cast-iron tubs, 
of about 10 fect in diameter, paved with slabs of granite, 
