Conversation Page XI. The same Subject continued: Experiments 69 cal Balance; Specific Gravity of a Guinea on water 75 XIII. The same Subject continued: Experiments 82 XIV. The same Subject continued: Archimedes's Inventions; Hiero's Crown; Fraud de tected P 87 ཆ་བ XV. The same Subject Continued: Arithmetical Computation; Wrong to pass bad Money 91 XVI. Of the Hydrometer: Experiments; how the Slaves get at their Master's Rum; rectified Spirit XVII. Of the Hydrometer, and Swimming: Theo- XVIII. Of the Siphon: Weight of Air; Tantalus's 97 103 108 XIX. Of the Diver's Bell: invented by Dr. Halley; 119 XXI. Of Pumps: Common Pump described; deep Wells; Dr. Darwin's Description of Pumps 123 XXII. The same Subject continued: the ForcingPump; Fire-Engine; Rope-Pump; Water Press PNEUMATICS. XXIII. Of the Nature of Air: Wind; Air in motion; how Fish swim 128 137 Conversation XXIV. Of the Air-Pump: Dr. Darwin's Descrip- XXVI. Of the Pressure of Air: no such principle XXVII. The same Subject continued: the Trans- ferrer; Hemispherical Cups; Fountain in Vacuo; Bottle broken by the Pressure of Page XXX. Of the Compression of Air: Artificial Foun- tains; Condensing Syringe and common XXXI. Miscellaneous Experiments on the Air- Pump: why Smoke and Vapours ascend; XXXII. Of the Air-Gun, and Sound: Air-Guns ille- gal; Magazine Wind-Gun; Air the medium of Sound; Conductors of Sound; Striking XXXIII. Of Sound: Thunder; Gunpowder; Musical Chords; how far Sound can be heard; Velocity of Sound and Light; uses to XXXVIII. Of the Steam-Engine: when and by whom invented; Mr. Watt's Improvement 221 XXXIX. The same Subject continued XL. The same Subject, and Papin's Digester : Whitbread's Brewery; Accidents by Steam 232 XLI. Of the Barometer: Fluctuation of the Mer- cury; the Vernier; Rules for predicting XLII. Application of the Barometer to the Mea- XLIII. Of the Thermometer: Fahrenheit's Scale XLIV. The same Subject: Wedgewood's Scale of |