<s id="A18-3.04.01">4 The machine with three pillars is made in the following way.</s>
<s id="A18-3.04.02">We make pillars inclined towards one another, whose tips meet at one point, and attach at this point, where the three beams meet, a block and tackle, whose other part is fastened to the load.</s>
<s id="A18-3.04.03">If now the ropes of the block and tackle are tightened, the load rises.</s>
<s id="A18-3.04.04">The base of this tool is firmer and more secure than others, but it cannot be used well in every place, rather, only in places where we want to lift the load in the center of the tool.</s>
<s id="A18-3.04.05">Thus if we have to bring the load to a place, around which we can put up this tool, then we use it for that.</s>
