by Henry Draper
On the Construction of a Silvered Glass Telescope
Fifteen and a half inches in aperture, and its use in celestial photography
en
~3 hours (189K characters)
Project Gutenberg
Produced by Thiers Halliwell, Chris Curnow and the Online Distributed Proofreading Team at http://www.pgdp.net (This file was produced from images generously made available by The Internet Archive)