458 Intelligence and Miscellaneous Articles. 



IRON TRADE. 



In the year J 740 the whole iron made in Great Britain was 



17,000 tori3 from 59 furnaces. 

 In 1788, it had increased to 68,000 tons from 121 furnaces. 

 In 1796, it had increased to 125,000 

 In 1806, it had increased to 250,000 

 In 1820, it had increased to 400,000 



In 1827, it had increased to 690,000 tons from 284 furnaces. 

 The different counties in which it is made are as under in 1827. 



Staffordshire 21 6,000 tons from 95 furnaces. 



Shropshire 78,000 tons from 3 1 furnaces. 



South Wales 272,000 tons from 90 furnaces. 



North Wales 24,000 tons from 12 furnaces. 



Yorkshire 43,000 tons from 24 furnaces. 



Derbyshire 20,500 tons from 14 furnaces. 



Scotland 36,500 tons from 18 furnaces. 



690,000 tons from 284 furnaces. 



About 3-10ths of this quantity is of a quality suitable for the foun- 

 dry, which is all used in Great Britain and Ireland, with the exception 

 of a small quantity exported to France and America. The other 7- 1 Oths 

 is made into bars, rods, sheets, &c, of which a large quantity is ex- 

 ported to all parts of the world. — Repertory of Arts, October 1 828. 



EARLY HISTORY OF ELECTRO-MAGNETISM. 



In the year 1801, Gautherot brought two fine piano-forte strings 

 in contact, one with the upper and the other with the lower end of 

 the pile, keeping the extremities fluttering in the air. When these 

 ends touched each other, he says, {Ann. de Chim. torn, xxxix. p. 209.) 

 " A very decisive adhesion took place ; they seemed united as by a 

 magnetic power, which was so strong that he could move the united 

 wires in every direction to a distance of some centimetres." Thus it 

 may be seen that, in the investigation of Nature, a few detached ob- 

 servations are insufficient, but that they must be pursued and com- 

 bined j by which means it was that CErsted became the discoverer of 

 electro-magnetism.— Schweigger's Jahrbuch, 1828. p. 110. 



RUSSIAN COINAGE OF PLATINA. 



A letter from Professor Breithaupt to Dr. Schweigger-Seidel, an 

 extract from which is given in a late Number of the Jahrbuch de Chemie, 

 &c, confirms the statement some time since made by the newspapers, 

 that the Russian Government had resolved to coin a large sum in 

 Siberian platina. It appears that Count Denidoff, the proprietor of 

 the locality where the platina was discovered, has disposed of to the 

 Government the quantity of that metal which had been collected. He 

 has sent four young Russians, destined for official situations in Si- 

 beria, to be educated at the Mining Academy of Freyberg. 



ANALYSES 



