Intense Heat, — Steam- Engines. — Eccpedilion to Africa, \ 5 1 



INTENSE HEAT. 



Our chemical and mineralogical readers will be glad to Isear, 

 that by means of a blow-pipe for burning the gaseous constituents 

 of water, in a state of high condensation, and which is con- 

 structed by Mr. Newman, of Lisle- street, Leicester-square, a 

 degree of heat may be produced greater than that of the most 

 powerful Galvanic batteiv. Professor Clarke, of Cambridge, 

 who is engaged in a series of analytical experiments with the 

 blow- pipe, has already succeeded in the decomposition of tl;e 

 earths; having obtained metals from barytes and strontian, 

 which do not become oxided bv exposure to atmospheric air. 

 The metal of barytes is ductile, and has the lustre of silver. Au 

 account of these experiments will be shortly before the public. 



A correspondent in Sussex has remarked the very rapid avd 

 great evaporation from the earth's surface during the clear in- 

 tervals of the late showery u'eather, — a circumstance which may 

 account in some measure for the continuance of so much raia. 



STEAM ENGINES IN CORNWALL. 



By Messrs. Leans' Report for July, the average work of twenty- 

 seven engines was 20,142,363 pounds lifted one foot high with 

 each bushel of coals consumed. 



During the same month the work performed by Woolf's en- 

 gine at Wheal Vor was 47,610,798 pounds lifted one foot high 

 with each bushel. His engine at Wheal Abraham that is in full 

 work, Uftcd during the same month 51, 1)23, 679 pounds one foot 

 with each bushel. His other engine at the same mine, not vet 

 at her full load, lifted 23,794,469 pounds to the same height 

 with every bushel of coals. 



The last mentioned engine has a 60-inch cylinder, but is only 

 loaded 2 lib. J) per scpiare inch ; wlnle ids other engine at the 

 same mine (with a 45-inch cylinder) bas a load of 15 lib. 1 per 

 s(iuarc inch ; that is, a great portion of the coals consumed v/Ith 

 the G')-incii cylinder engine goes only to the motion of tiie en- 

 gine. !• 



MAJOR PEDDIE's KXPEDITION TO AFRICA. 



The spring transport which carried Major Peddie and his 

 ''ompanion Capt. Campbell to Africa, arrived after a tedious 

 passage at Goree ; but tlic death of the surgeon who was to have 

 accompanied them, which took place on the 8th of December 

 fit Senegal ; and the troops which were to have arrived from 

 ■Sierra Leone in December not joining till the 25th of February, 

 unavoidably delayed the department of the expedition from the 

 coast till too late for the seasim. This delay will, however, be 

 K 4 attended 



