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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: upright beam of the beacon was to be fixed to the rock by two
strong and massive bats or stanchions of iron. These bats,
for the fixture of the principal and diagonal beams and
bracing chains, required fifty-four holes, each measuring two
inches in diameter and eighteen inches in depth. There had
already been so considerable a progress made in boring and
excavating the holes that the writer's hopes of getting the
beacon erected this year began to be more and more confirmed,
although it was now advancing towards what was considered the
latter end of the proper working season at the Bell Rock. The
foreman joiner, Mr. Francis Watt, was accordingly appointed to
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