Altitude tables computed for intervals of four minutes between the parallels of latitude 31⁰ and 60⁰ (0⁰ and 30⁰) and parallels of declination 0⁰ and 24⁰. Designed for the determination of the position line at all hour angles without logarithmic computation. (Supplement.).
Ball, Frederick, Naval Instructor.
London, 
1907-1909.