A LESSON IN MACHINERY Ways various machinery works. Shots include train wheels, a dump truck, a man shoveling sand into a box, the same man pulling the box up an incline, a diagram showing how a wedge is useful in lifting and splitting objects, a knife and chisel are demonstrated as wedges, a screw is shown as a sort of incline, a screw clamp holds a block of wood in place, a screw jack is demonstrated being moved by hand and by lever, the lever's various parts are shown, we see a person's hands typing and various rotary levers/pulleys are shown and demonstrated.
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