THE BAROMETER. 



Maxim of the Ancients. Abhorrence of a Vacuum. Suction. Galileo's Investigations. Torricelti 

 discovers the Atmospheric Pressure. The Barometer. Pascal's Experiment. Requisites for a 

 good Barometer. Means of securing them. Diagonal Barometer. Wheel Barometer Ver- 

 nier. Uses of the Barometer. Variation of Atmospheric Pressure. Weather-Glass. Rules in 

 common Use absurd. Correct Rules. Measurement of Heights. Pressure on Bodies. Why 

 net apparent. Effect of a Leather Sucker. How Flies adhere to Ceilings and Fishes to Rocks. 

 Breathing. Common Bellows. Forge Bellows. Vent Peg. Tea-Pot. Kettle. Ink Bottles. 

 Pneumatic Trough. Gurgling Noise in decanting Wine. 



