[DOWNLOAD] "Scientific American Supplement, No. 803, May 23, 1891" by Various Authors ~ Book PDF Kindle ePub Free
eBook details
- Title: Scientific American Supplement, No. 803, May 23, 1891
- Author : Various Authors
- Release Date : January 01, 2012
- Genre: Antiques & Collectibles,Books,Lifestyle & Home,
- Pages : * pages
- Size : 3156 KB
Description
The great instrument which has just completed the installation of our national observatory is constructed upon the same principle as the elbowed equatorial, 11 in. in diameter, established in 1882, according to the ingenious arrangement devised as long ago as 1872, by Mr. Loewy, assistant director of the Paris Observatory. We shall here recall the fact that the elbowed equatorial consists of two parts joined at right angles. One of these is directed according to the axis of the world, and is capable of revolving around its own axis, and the other, which is at right angles to it, is capable of describing around the first a plane representing the celestial equator.