<s id="A18-3.09.01">9 The ways of lifting heavy objects and of bringing them to a height are thus the ones mentioned by us.</s>
<s id="A18-3.09.02">We have, however, to take into consideration place, time and other requirements and to explain how we proceed according to each single one of (these circumstances).</s>
<s id="A18-3.09.03">For transporting big blocks off the peaks of high mountains one employs equipment to keep the stone [block] from rolling because of the slope of the mountain through its own downward motion, and from falling onto and destroying the draught animals that pull it and the wagon.</s>
<s id="A18-3.09.04">Therefore one uses on the mountain, in the place where one wants to transport the stone [block] downhill, two tracks that one possibly levels off, and one takes two four-wheeled wagons, one of which one puts in the highest position of the track that one wants to transport the stone [block] on, the other one in the lowest position of the second track.</s>
<s id="A18-3.09.05">Then one attaches pulleys to a firm post between the two tracks, leads from the wagon that carries the stone [block] ropes over the pulleys and makes them go to the lower wagon.</s>
<s id="A18-3.09.06">This lower wagon one loads with small rocks that result from the cutting of the big block, until it is loaded with a weight (a little) less than that of the stone [block] that is to be transported down.</s>
<s id="A18-3.09.07">Hereupon one hitches up to this wagon draught animals that pull it upward and through the gradual climbing of this wagon the big stone [block] also moves easily and gradually downward.</s>
