On the power of penetrating into space by telescopes : with a comparative determination of the extent of that power in natural vision, and in telescopes of various sizes and constructions; illustrated by select observations. By William Herschel, LL.D. F.R.S. From the Philosophical transactions. - Herschel, William (Printed by W. Bulmer and Co. Russel-Court, Cleveland-Row, St. James's, 1800)