4^06 Lisi of Scottish Patmts. 
a pressure of above 100 lb. The steam had been quickly raised 
to such a degree, that an oscillating movement in the boiler had 
been perceived for a considerable time. While Mr Boult, with 
four of his men, were anxiously looking on, it suddenly burst, 
and destroyed four out of the five individuals, among whom was 
Mr Boult himself. Mr S. Leet, who examined the boiler after- 
wards, found the bottom completely torn away, on one side, from 
the seat of the vessel, and forced into the ash-pit. The plates 
of iron one-half inch thick, which formed the bottom of the 
boiler, were twisted from the convex to the concave ibrm, and 
the two surfaces of the severed plates were comparatively smooth. 
By this accident, a part of the premises was completely destroy- 
ed and in ruins ; the windows of the adjoining houses were en- 
tirely broken ; and a building about fifty yards distant was set 
on fire by the pieces of ignited fuel which fell upon its roof. — 
See Phil, Mag. vol. lx. p. 67. 
32. Copper 7'aised in Great Britain during the year ending 
^Oth June 1822. — The following is the aggregate quantity of 
pure copper produced in all the mines of Great Britain and Ire- 
land, during the year ending SOth June 1822. 
Copper Ore. Pure Copper. 
Tons. 
Tons. 
Value of Ore. 
Sold at the Ticketings, in Cornwall, 
104,529 
9140 
X 663,085 13 
2 
Sold at Swansea, from Ireland, and ] 
various parts of England and Wales, J 
j- 3,539 
3S8 
30,967 
12 
6 
Devon, .... 
• « 
532 
about 46,000 
0 
0 
Sundry private sales. 
% • 
184 
do. 16,000 
0 
0 
Anglesea, (estimated at) * 
600 
do. 45,000 
0 
0 
Tons, 
10844 
, £801,053 
5 
8 
See PhiL Mag, vol. lx. p. 75. 
Art. XXIX.— of Patents granted in Scotland from ISth 
April to August 1822. 
17. William Cleland of the city of Glasgow, in 
North Britain, gentleman, for his invention of an “ improved ap- 
paratus for the purpose of evaporating liquids.” Sealed at Edin- 
burgh 12th June 1822. 
To PiEERE Evard of Great Marlborough Street, in the 
