384 Intelligence and Miscellaneous Articles. 



Exp. 7. Copper and brass wires, each 3 inches long and £thof an 

 inch in diameter, more rapid conduction from copper to brass than 

 vice versd by 6 or 8 seconds. 



Exp. 8. Wires of brass and iron, each 3 inches long and £th of 

 an inch in diameter, quickest transmission of heat was from brass to 

 iron by 5 or 8 seconds : repeated with similar results. 



Exp. 9. Brass and lead wires, each 3 inches long and -^th of an 

 inch in diameter, the quickest heat conduction was from brass to 

 lead by about 50 or 60 seconds. 



Exp. 10. Wires of zinc and brass, each 2£ inches long and y^tti 

 of an inch in diameter, fastest heat conduction was from zinc to brass 

 by 2 or 3 seconds : similar results obtained when repeated with wires 



2 inches long and y^th of an inch in diameter. 



Exp. 11. Large and small brass wires, 3 inches long and £th and 

 ith of an inch in diameters, the quickest transmission of heat was 

 from the larger to the smaller wire by 5 or 8 seconds : repeated 

 several times with similar results. 



Exp. 12. Copper and iron wires, each 3 inches long and ^th of 

 an inch in diameter, the conduction of heat was more rapid from 

 copper to iron than vice versd by 10 or 15 seconds : repeated with 

 similar results. 



Exp. 13. Copper and lead wires, each 2 inches long and y^th of 

 an inch in diameter, the conduction of heat was fastest from copper 

 to lead by 20 or 25 seconds : repeated with similar results. 



Exp. 14. Zinc and copper wires, each 2^ inches long and yoth of 

 an inch in diameter, the conduction of heat was more rapid from 

 copper to zinc than vice versd by 8 or 10 seconds. 



Exp. 15. Large and small copper wires, 3 inches long and £th 

 and -i-th of an inch in diameters, the quickest transmission of heat 

 was from the large to the small wire by 8 or 10 seconds : repeated 

 several times with similar results. 



Exp. 16. Iron and lead wires, each 3 inches long and ith of an 

 inch in diameter, the fastest conduction of heat was from iron to 

 lead by 20 or 30 seconds. 



Exp. 17. Zinc and iron wires, each 2|- inches longand y^thof an 

 inch in diameter, the most rapid transmission of heat was from zinc 

 to iron by 12 or 15 seconds : repeated with wires 2 inches long with 

 similar results. 



Exp. 18. Large and small iron wires, 3 inches long and |th and 

 £th of an inch in diameters, the fastest conduction of heat was from 

 the large to the small wire by 15 or 20 seconds : repeated with wires 



3 inches long and yV n and -£th of an inch in diameters with similar 

 effects. 



Exp. 19. Zinc and lead wires, each 1|- inch long and yVth of an 

 inch in diameter, the quickest conduction of heat was from zinc to 

 lead by 30 or 40 seconds : repeated with similar effects. 



Exp. 20. Large and small zinc wires, 2\ inches long and y^th 

 and yV*h of an inch in diameters, the quickest conduction of heat 

 was from the large to the small wire by 6 or 8 seconds. 



Taking the following series of metals, viz. copper, brass, iron, zinc, 



