<s id="A18-3.06.01">6 Since it happens sometimes with the tool that looks like a catapult, with which one lifts stones, that it is awkward to put the stone where one has to put it, we use the instrument that is called "loop".</s>
<s id="A18-3.06.02">We draw on the surface of the stone, namely the plane <abgd>, a figure like the one illustrated in the drawing.</s>
<s id="A18-3.06.03">Each of the planes <ezhq> and <klmn> is, namely a rectangle; let <ezhq> be wider than <klmn>.But let them be equal in length, i.e., let the line <kl> be equal to line <eh>.</s>
<s id="A18-3.06.04">Then we carve this figure deeply into the stone, let the depth of the hollow correspond to the weight of the stone.</s>
<s id="A18-3.06.05">Let the hollow of the plane <ezhq> be evenly perpendicular, that of plane <klmn>, however, inclined, i.e., let the lower part be wider than the upper one, so that a hollow like a wooden lock is formed.</s>
<s id="A18-3.06.06">Let the narrow (part) be equal to <klmn>, the wide one equal to <ezhq>.</s>
<s id="A18-3.06.07">Then we make a body of iron that also looks like a wooden bolt, that fits into this hollow, to the upper part of which a ring is attached and that goes into the hollow <ezhq>, so that it is entirely inside; then one pushes and shoves it, until it goes into the parent hollow (<klmn>), without shifting.</s>
<s id="A18-3.06.08">Now one puts into the hollow <ezhq> a [piece of] wood so that the iron does not slip out.</s>
<s id="A18-3.06.09">Then one attaches to the ring that is on the iron peg the ropes that carried the catapult, in which the stone was lying, and lifts it in this way, until it reaches the intended place, without being hindered by anything.</s>
<s id="A18-3.06.10">When the stone is put in its place, the wooden peg is removed, the iron pulled out, to be inserted into another stone that is also lifted.</s>
