Complete Extant Works of Hero of Alexandria, Vol. 2 (1900) - Page 11

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32 (32).	Equilibrium on the balance beam with weights suspended at will	85
33 (33).	Equilibrium on an irregular balance beam	87
34 (34).	Equilibrium for loads suspended at the periphery of a disk	91


1 (1.)	The five simple powers Classical simple machines.. The wheel on the axle	95
2 (2).	The lever	97
3 (3).	The pulley system	99
4 (4).	The wedge	103
5 (5).	The screw	105
6 (6).	The screw in combination with the wheel on the axle	109
7 (7).	Justification of the effect of the five powers. Effect of force and load on two concentric circles	111
8 (8).	Explanation of leverage with a suspended load	113
9 (9).	Explanation of leverage with a supported load	117
10 (10).	Explanation of the wheel on the axle	121
11 (11).	Explanation of the simple pull	121
12 (12).	Explanation of the double pull	123
13 (13).	Simple or double pull, depending on whether one end of the rope is attached to the load or to a fixed anchor point	127
14 (14).	Effect of impact on the wedge	131
15 (15).	Every blow moves every wedge	131
16 (16).	Formation of the screw	135
17 (17).	Consideration of the screw as a wound wedge	139

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