r 



^ 



Scieulijic IntclUgcnce.— Mechanical rhilosopJuj. 173 



2. Iron Works of Sweden. —The account of exporlalion of iroa 

 from Sweden during tlie year 1828, in tons of 1000 kiio-grammcs 

 each, (2200 lbs.) was as follows : 



United States, 

 Germany, 



Great Britain, 

 France, 

 Portugal, - - 

 Denmark, 



Low Countries, 

 Indies, 



Russia, 

 Brazil, 

 Malta, 

 Spain, 



Antilles," 

 Italy, - 



Norway, 



9.409 tons. 



6.676 



6,753 



5,096 



3.200 



1.771 



1.436 



893 



350 



289 



142 



64 



58 



40 



35 



Total, 35.212 10115. 



Tiie value of which, in the Swedish ports, is from ten to eleven mil- 

 lions of francs, (two to 2 1-5 millions of dollars.) 



This is about one fifth of the total production of France. In 

 Sweden, the only fuel with which the forges are supplied is wood ; of 

 course the fabrication is limited to the annual production of tliis com- 

 bustible, and cannot be increased as in forges supplied witli pit coal. 

 Hence, if the demand for Swedish iron should rise much above what 

 It Is at present, it is probable that the price would augment rather 

 than the production increase. We have not much satisfactory infor- 

 mation on the metallurgic resources of Sweden, and It appears that 

 in relation both to art and economy, we have much yet to learn from 

 them. This knowledge would come very seasonably at a time when 

 our forges are calling for important ameliorations, and capital is wait- 

 ing only to he secure in its results. — Rev. Encyc. Maij 1829. 



3. Calorific effects of the Voltaic pile. — Prof. De La Rive, in a 

 memoir read to Soc. de Phys. et d' Hist. Nat. of Geneva, on the 

 4th of Sept. 1828, considers these effects as owing to the difficulty 

 . which the electric current finds in passing from one body to another, 

 or from one molecule to the foUowiiis:, and to the resistance which it 

 nieets in these successive transits. 



