seven-and-a-half-inch

Updated: May 4, 2025

A neighboring double of similar hues is 52, in which the magnitudes are four and nine, distance 6", p. 60°. Sweeping a little way northward we come upon an interesting binary, lambda, which is unfortunately beyond the dividing power of our largest glass. A good seven-inch or seven-and-a-half-inch should split it under favorable circumstances.

Garrett Putman Serviss - Pleasures of the telescope: An Illustrated Guide for Amateur Astronomers and a Popular: Description of the Chief Wonders of the Heavens for General: Readers