THE THERMOMETER. 



Advantages n." mercurial Thermometer. Method of constructing one. To purify the Mercury. 

 Formation of the Tube. To fill the Tube. Determination of the freezing and boiling Points. 

 Modes of Graduation. Alcohol Thermometers. Difficulty of fixing the boiling Point. Useful- 

 ness of the Thermometer. History of its Invention. Methods of comparing Scales of different 

 Thermometers. 



vor,. ii. 9 



