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In this work, the first thing to be considered was, how to continue a right line: and this was done by setting up marks with the assistance of an equal altitude or transit instrument (for it was contrived so as to serve either purpose at pleasure), made by Mr. John Bird, of the same construction with that described by M. Le Monnier, in the preface to the single volume of the French Histoire Celeste.

XLII. Observations for determining the length of a degree of latitude in the provinces of Maryland and Pennsylvania, in North America