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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Records of a Family of Engineers by Robert Louis Stevenson: pulley in the middle of the bridge. Immediately under the
cross-beam a hatch was formed in the roadway of the bridge,
measuring seven feet in length and five feet in breadth, made
to shut with folding boards like a double door, through which
stones and other articles were raised; the folding doors were
then let down, and the stone or load was gently lowered upon a
waggon which was wheeled on railway trucks towards the
lighthouse. In this manner the several castings of the
balance-crane were got up to the top of the solid of the
building.
The several apartments of the beacon-house having been
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