When the Work requires more Force than can be produced in the time allowed for its Operation. Fly-wheel, Rolling-iron, § 20. Anecdote of punching Plate-iron, 21. Pile-engine, 22. Effects of the power of Gunpowder in expelling different charges. Le Vaillant's experiment with water substituted for shot, 23. Phenomenon of Fulminating Powder, 24. Velocity of a Wave passing through Deal, supposed to be greater than through Tallow, 25. Existence of Momentary pressures of various force in the boiler of a steam-engine, 25*. Reasoning on the Theory of Explosion, 26.
Governor of Steam-engine. Ditto moving in Water at Chatham, § 27. Cataract for regulating Engines in Cornish Mines, 28. Uniform supply of Fuel to Steam-engine. Consuming Smoke, 29. Vane regulated by Resistance of Air. Striking Clock, 30. Suggestions for the adaptation of a Vane or Fly to an instrument for measuring the altitude of Mountains, 31.
Fatigue arising from Rapidity of muscular Exertion, contrasted with its Magnitude, § 32. Most advantageous Load for a Porter, 33. Tags of Boot-laces, 34. Spinning by Hand and by Wheel. Machines to wind Riband and Sewing Cotton, 35. Tilt-hammer driven down by a Spring, 36. Sithe-making, 37. Safety of Velocity in Skating, 38. Application of sudden force to a flat-bottomed Boat to increase the speed. Reaction of the Water, 39. Great Velocity of moving bodies an impediment to the full effect of their weight, 40. Essential importance of Rapidity in Mining Operations, 41. Window glass, 42. Smoke-jack, 43. Telegraphs, 44.
