Abstract
In the annexed Scheme, <italic>P Q R S</italic> denotes a Plate of Brass, accurately divided in the Limb into <italic>DQ</italic>, into 1/2 Degrees, 1/2 Minutes, and 1/12 Minutes, by a Diagonal Scale; and the 1/2 Degrees, and 1/2 Minutes, and 1/12 Minutes, counted for Degrees, Minutes, and 1/6 Minutes.
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