INTENDED FOR THE INSTRUCTION AND ENTERTAINMENT AOF YOUNG PEOPLE: IN WHICH THE FIRST PRINCIPLES OF NATURAL AND EXPERIMENTAL PHILOSOPHY ARE FULLY EXPLAIN E D.. VOL. IV. OF PNEUMATICS. "Conversation, with the habit of explaining the meaning of words, PATERNOSTER ROW; AND R. HUNTER (SUCCESSOR CONTENTS то I. Of the nature of Air: Wind, Air in Mo- II. Of the air-pump: Dr. Darwin's Descrip- tion; Barometer-gauge; Resistance of IV. Of the Pressure of the Air: No such VIII. Of the Compression of Air: Artificial fountains: Condensing Syringe and common Squirt compared................. 69, X. Of the Air gun and Sound: Air-guns ille- gal; Magazine Wind-gun; Air, the medium of Sound; Conductors of Sound; Striking Experiment..... XI. Of Sound: Thunder; Gunpowder; Musi- cal Chords; how far Sound can be heard; Velocity of Sound and Light; Uses to which this Knowledge may be applied.. 97 XIX. Of the Barometer: Fluctuation of the Mercury; the Vernier: Rules for pre- dicting the changes of the Weather..... 189 XXI. Of the Thermometer: Fahrenheit's Scale 211 XXII. The same subject; Wedgewood's Scale |