Note 19 — Chapter XXI · THE ADJUSTMENTS OF THE EQUATORIAL.
Reading edition
Since the velocity of the star varies as the cosine of the declination, the error of collimation at the equator = 2m. 25·5s. cos. 0° 45´·5 = 2m. 25·08s.; and for non-equatorial stars, 2m. 25·08s. sec. dec.