Archive for date: December 10, 2008

Gutenberg Gem: Astronomical Instruments and Accessories, by Wm. Gaertner & Co.

December 10, 2008 | Astronomy, Public Domain Resources | By: Mark VandeWettering

It’s been quite some time since I posted a “Gutenberg Gem”, a book from Project Gutenberg that might deserve some special attention. Today’s example contains a bunch of nice illustrations about telescopes and their associated astronomical instruments. Very nice. Not just traditional refracting telescopes, but also instruments like spectrum comparators and filar micrometers. The Project […]