Vol. 1. A-F, Vol. 2. G-O, Vol. 3. P-Z modern period.

Excerpt from Researches on Astronomical Spectrum-Photography As will be easily understood, these Operations upon stellar spectra were by no means carried on continuously. But only during Dr. Draper's summer residence at his country place, and in the intervals of other. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.