Atoms, 6. Coherence of, 7. Attraction, magnetic, of gravitation, 8, 50, 64. Molecular or atomic, 69. Cohesion, 70. Attwood, machine of, 92. Axes, principal, 138. Axis, mechanical properties of, 128. B. Balance, 279. Of Bates, 288. Use of, 289. Danish, 299. Bent-lever of Brady, 301. Bodies, 2. Lines, surfaces, edges, area, length of, 4. Figure, volume, shape of, 5. Porosity of, 17. Compressibility of, 18. Elasticity, dilatibility of, 19. Inertia of, 27. Rule for determining velocity of; motion of two bodies after impact, 38. C. Capillary attraction, 73. Capstan, 179. Cause and effect, 7. Circle of curvature, 99. Cog, hunting, 191. Components, 51. Cord, 163. Cordage, friction and rigidity of, 260. Crank, 241. Crystallisation, 14. Cycloid, 158. D. Damper, self-acting, 234. Deparcieux’s compensation pendulum, 319. Diagonal, 51. Dynamics, 160. Dynamometer, 305. E. Electricity, 76. Electro-magnetism, 76. Equilibrium, neutral, instable, and stable, 118. F. Figure, 5. Fly-wheel, 239. Force, 6. Composition and resolution of, 49. Centrifugal, 98. Moment of; leverage of, 135. Regulation and accumulation of, 224. Friction, effects of, 96. Laws of, 264. G. Governor, 227. Gravitation, attraction of, 77. Terrestrial, 84. Gravity, centre of, 107. Gyration, radius of, centre of, 137. H. Hooke’s universal joint, 252. Hydrophane, porosity of, 18. I. Impact, 39. Impulse, 65. Inclined plane, 163–209. Inclined roads, 211. Inertia, 27. Laws of, 32. Moment of, 137. J. Julien le Roy, compensation tube of, 319. L. Lever, 163. Fulcrum of; three kinds of, 167. Equivalent, 176. Line of direction, 110. Liquids, compressibility of, 24. Loadstone, 68. M. Machines, simple, 160. Power of, 175. Regulation of, 225. Magnet, 68. Magnetic attraction, 8. Magnetism, 76. Magnitude, 4. Marriott’s patent weighing machine, 305. Materials, strength of, 272. Matter, properties of, 2. Impenetrability of, 4. Atoms of; molecules of, 6. Divisibility of, 9. Examples of the subtilty of, 12. Limit to the divisibility of, 13. Porosity of; density of, 17. Compressibility of, 18. Elasticity and dilatability of, 19. Impenetrability of, 22. Inertia of, 27. Mechanical science, foundation of, 16. Metronomes, principles of, 153. Molecules, 6. Motion, laws of, 46. Uniformly accelerated, 87. Table illustrative of, 90. Retarded; of bodies on inclined planes and curves, 94. Rotary and progressive, 127. Mechanical contrivances for the modification of, 245. Continued rectilinear; reciprocatory rectilinear; continued circular; reciprocating circular, 246. N.