Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Table showing the actual magnifying power of thirty-five microscopical objectives of various makers, as determined at a meeting of the Bailey Microscopical Club, held in New York, September 20, 1870
Table showing the actual magnifying power of thirty-five microscopical objectives of various makers, as determined at a meeting of the Bailey Microscopical Club, held in New York, September 20, 1870