XV INTRODUCTION. 



resolution. Displacements of a connected system. Principles of 

 mechanism. Rolling contact, sliding contact, belting, link con- 

 nexions, shafting, universal joints, &c. Transmission of work. 

 Relation between the displacement of two pieces of a machine and 

 the forces which they transmit. The mechanical powers. Instru- 

 ments for illustrating the laws of motion, such as pendulums, 

 gyroscopes, dynamical tops. 



Laws of fluid pressure ; stability of floating bodies. 



Discharge of fluids through orifices, and their motion in 

 channels. 



Hydraulic and pneumatic transmission of power. 



Molecular Physics. 



Instruments and apparatus employed in teaching, and in the 

 investigations and observations connected with : 



Pressure on Matter. Tension, Compression (piezometer) Tor- 

 sion, Flexion ; Relation of volume to pressure ; Elasticity of 

 liquids and gases. Hardness (of solids and liquids), Toughness, 

 Brittleness, Malleability, &c. 



Communication of Pressure through Fluids. Pressure of air, its 

 consequences and Applications. Barometers, Air-pumps, Siphons, 

 Suction-pumps, Spirators, &c. ; Pressure of water, its consequences 

 and applications, Levels, Side pressure, &c. 



Density. Methods of measuring densities of Gases, Vapours, 

 Liquids, Solids. 



Adhesion and Cohesion. Condensation of gases in solids, Solu- 

 tion of gases in liquids, Mixing of gases with gases (Diffusion, 

 Transpiration, &c.), Absorption of liquids by solids (Capillarity, 

 &c.), Absorption of liquids by gases (Evaporation, &c.), Mixing of 

 liquids with liquids (Osmose, Diffusion Dialysis). Evaporation of 

 solids, Solution of solids, Mixture of solids with solids (Cementa- 

 tion, &c.). 



Sound. 



Instruments and apparatus employed in teaching, and in the 

 investigations and observations connected with : 



Geometrical, Mechanical, and Optical methods of Illustrating 

 the Laws of Wave Motion. Progressive waves, Composition of 

 Vibrations, Interference, Stationary waves. 



Generation of Sound. Fog-horn, &c. 



Conduction of Sound. Through solids, liquids, and gases, 

 Stethoscopes. 



Velocity of Sound. 



Detection of Sound. Sensitive flame, &c. 



Reflexion and Refraction. Ear trumpets, Acoustic lenses, &c. 



Dispersion and Absorption. 



