in various Substances. 411 



the 80th degree or boiling point upon the tube of the 

 inclosed thermometer, and taking out the thermometer, 

 Ichoaked the cylinder again in this place. Introducing 

 now the thermometer for the last time, I closed the 

 opening at the bottom of the globe at the lamp, taking 

 care before I brought it to the fire, to turn the cylinder 

 upside down, and to let the bulb of the thermometer 

 fall into the cylinder till it rested upon the lower choak 

 in the cylinder. By this means the bulb of the ther- 

 mometer was removed more than 3 inches from the 

 flame of the lamp. The opening at the bottom of the 

 globe being now closed, and the bulb of the thermom- 

 eter being suffered to return into the globe, the end of 

 the cylinder was cut off to within about half an inch of 

 the upper choak. This being done, it is plain that the 

 tube of the thermometer projected beyond the end of 

 the cylinder. Taking hold of the end of the tube, I 

 placed the bulb of the thermometer as nearly as possible 

 in the center of the globe, and observing and marking a 

 point in the tube immediately above the upper choak of 

 the cylinder, I turned the cylinder upside down, and 

 suffering the bulb of the thermometer to enter the 

 cylinder, and rest upon the first or lower choak, (by 

 which means the end of the tube of the thermometer 

 came further out of the cylinder,) the end of the tube 

 was cut off at the mark just mentioned, (care having 

 first been taken to melt the internal cavity or bore of 

 the tube together at that place,) and a small solid ball of 

 glass, a little larger than the internal diameter or open- 

 ing of the choak, was soldered to the end of the tube, 

 forming a little button or knob, which resting upon the 

 upper choak of the cylinder served to suspend the ther- 

 mometer in such a manner that the center of its bulb 



