THE LEYER AID HEELOR. 



Simple Machine. Statics. Dynamics. Force. Power. Weight. Lever. Cord. Inclined 

 Plane. Arms. Fulcrum. Three kinds of Lever. Crow-Bar. Handspike. Oar. Nat- 

 Crackers. Turning Lathe. Steelyard. Rectangular Lever. Hammer. Load between two 

 Bearers. Combination of Levers. Equivalent Lever. Wheel and Axle. Thickness of the 

 Rope. Ways of applying the Power. Projecting Pins. Windlass. Winch. Axle. Horizon- 

 tal Wheel. Treadmill. Cranes. Water- Wheels. Paddle-Wheel. Rachet- Wheel. Rack. 

 Spring of a Watch. Fusee. Straps or Cords. Examples of. Turning Lathe. Revolving 

 Shafts. Spinning Machinery. Saw-Mill. Pinion. Leaves. Crane. Spur- Wheels. Crown- 

 Wheels. Bevelled Wheels. Hunting-Cog. Chronometers. Hair-Spring. Balance- Wheel. 



VOL. II. 16 



