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2We will begin by describing those engines which are chiefly used in the erection of sacred buildings, and other public works. They are made as follows: three pieces of timber are prepared suitable to the greatness of the weights to be lifted, connected at the top by a pin, but spreading extensively at their feet. These are raised by means of ropes made fast to the top, and when raised, are thereby kept steady. To the top is then made fast a block, by some called rechamus. In this block are two pulleys, turning on axles; over the upper pulley passes the leading rope, which, let fall and drawn through under the lower pulley of the bottom block is returned thence over the lower pulley of the upper block: the rope again descends to the lower block, and its end is made fast to the eye of it. We refer the other end of the rope to the description of the lower part of the machine.
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