The art of dialling : performed geometrically ... arthmetically ... instrumentally ... (1700)
Leybourn, William, 1626-1716 · London : T. Braddyll · leaf 160
Inftrufflental Dialling « 144 ( Seffion III TiO find the Angle that the Meridian makes with the Horizon¬ tal Line of the Plain, Flrfl , Draw the two Lines A B, and A C, making a right angle at A. Secondly , Lay the Centre of the Trigon … 54 deg. 29 min. which is the Complement of 3 5 d. 3 1 m. and an Angle of that quan¬ tity doth the Meridian make with the Horizon. By thefe Three Sections of this Chapter, you have reduced
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