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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: attend at the rock to-day, when the necessary levels were
taken for the step or seat of each particular beam of the
beacon, that they might be cut to their respective lengths, to
suit the inequalities of the rock; several of the stanchions
were also tried into their places, and other necessary
observations made, to prevent mistakes on the application of
the apparatus, and to facilitate the operations when the beams
came to be set up, which would require to be done in the
course of a single tide.
[Tuesday, 25th Aug.]
We had now experienced an almost unvaried tract of light
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