Book contents
- Frontmatter
- PREFACE
- Contents
- LIST OF THE PLATES
- INSTRUMENTS
- LIST OF ABBREVIATIONS ADOPTED IN THIS WORK
- The Negatives–measurement of the photographic field–scales of the enlargements
- Epoch of the Fiducial Stars, A.D. 1900
- Table
- Deterioration of the Negatives
- Effects of Atmospheric Grlare and of Diffraction upon the films of photographic plates
- Arrangement of the Plates
- Method for micro-puncturing the photographic discs of stars on plates to obtain their optical centres for purposes of measurement
- Star Catalogues and Photographic Charts
- Duration of the effective exposures given to photographic plates in the 20-inch reflector
- Are the millions of Stars and the numerous Nebulosities, which are now known to exist, limited in number and extent; and do they consequently indicate that the Universe, of which the Solar System constitutes a part, is only one member of a greater Stellar Universe?
- The Evolution of Stellar Systems
- Inferences suggested by examination of the Photographs
- Description of the Photographs
- Description of the Photographs
Inferences suggested by examination of the Photographs
Published online by Cambridge University Press: 05 July 2011
- Frontmatter
- PREFACE
- Contents
- LIST OF THE PLATES
- INSTRUMENTS
- LIST OF ABBREVIATIONS ADOPTED IN THIS WORK
- The Negatives–measurement of the photographic field–scales of the enlargements
- Epoch of the Fiducial Stars, A.D. 1900
- Table
- Deterioration of the Negatives
- Effects of Atmospheric Grlare and of Diffraction upon the films of photographic plates
- Arrangement of the Plates
- Method for micro-puncturing the photographic discs of stars on plates to obtain their optical centres for purposes of measurement
- Star Catalogues and Photographic Charts
- Duration of the effective exposures given to photographic plates in the 20-inch reflector
- Are the millions of Stars and the numerous Nebulosities, which are now known to exist, limited in number and extent; and do they consequently indicate that the Universe, of which the Solar System constitutes a part, is only one member of a greater Stellar Universe?
- The Evolution of Stellar Systems
- Inferences suggested by examination of the Photographs
- Description of the Photographs
- Description of the Photographs
Summary
The next step to be taken is to verify the accuracy of the above statements regarding the grouping of the stars into lines and curves; assuming that the examiner has, like myself, been convinced of their reality. As a test of this, as well as an example let us examine Plates 2 to 9, upon which the eye readily detects many groups of stars arranged in lines and in curves, each of them containing several stars; similar configurations to these can be seen on the other plates, and if I had chosen to print hundreds of others that are in my cabinets, each covering four square degrees in the sky, similar configurations would be seen upon them.
This persistency of the lines and curves of stars on the plates leaves no room for doubt that they are the effects of physical causes, and cannot be due to coincidence only; and when the photographs of the spiral and other nebulæ are examined a reasonable explanation of the formation of the curves and lines will be made manifest.
It is not my intention to submit elaborate arguments, or mathematical formulæ, in the discussion of the photographic evidence contained in this and in the first volume of my photographs–these will in the future, when a sufficient interval of time has elapsed, occupy the thoughts of the correlators, the measurers, the computers and of the mathematicians–my aim is now to point out the evidence, and the relationships to each other of the several classes of objects that are found depicted, untouched by hand-work, upon the photographs.
- Type
- Chapter
- Information
- Photographs of Stars, Star-Clusters and NebulaeTogether with Records of Results Obtained in the Pursuit of Celestial Photography, pp. 23 - 27Publisher: Cambridge University PressPrint publication year: 2010First published in: 1899