Astronomical instruments.
Chauvenet, William. 1820-1870.
A menual of sphericel and practical astronomy. With an apvendix on the method of least squares. Phila.: J. B. Lippincott & co. 18635. 2 v. 15 plates. 8°, 5911.7 Contents.- 1. Spherical astronomv. 2. Theory and | use of astronomical instruments; Method of least squares. _
Same. 5th University] ed., revised.