ON THE POWER OF FLUIDS TO CONDUCT HEAT. 81 



Experiment 7. 

 Took a cylindrical glafs tube, of 1 inch internal diameter, Exp. 7. Hot 

 and put \\ inches in depth of mercury into it, and immerfed JJ^iwt 

 the bulb and Hem of a thermometer to the bottom, the fcale heated it, 

 as ufual being above the liquid ; then put 2\ inches of warm 

 water upon it by a fyphon, and let it (land without agitation. 



TEMPERA TURE. TEMPERATURE. 



Experiment 8. 

 Into a tumbler glafs, 2f inches in diameter, poured an inch Exp. 8. Cold 

 in depth of mercury, and heated it to 1 10° ; upon which was ™^ "^j 1 * 

 poured an inch of water at 50°, and then kept ilill. heated. 



Finding that water was fo bad a conductor of heat, I was 

 defirous to learn how ice would conduct it, and tried it as 

 follows. 



Experiment 9. 



Feb. 9th. Out of a mafs of ice, by means of a hot iron, I Ice, immerfed 



fliaped a cylindrical piece, 3 inches in diameter, and 5\ inches freezing ^^ 

 long, clean and pure; its weight 17 ounces. Made a fmallture, conduced 

 round hole at one end, one inch deep, and the fize of a th er " much worfe"" 

 mometer bulb, which was inclofed in it. The other end of than water, 

 the piece was put into a bafon of fnow and fait, to the depth 

 of from \ to 1| inches, the temperature of which was kept 

 below 10° for 1| hours. Air 37°. 



Therm, in the Therm, in the 



Time elapfed. liquid. ice. 



5« 32° 



1| h. at a medium 7 31§ 



Vol. IV.— February. G N. B. 



