This book is included in the Self Reliance Shelter section.
PREFACE
SINCE the advent of the carbon filament incandescent lamp so
many wonderful discoveries have been made that the adoption of
the electric glow lamp as an illuminant is now almost universal.
A little thought will establish the fact, however, that the improvements
made have been chiefly in the lamp itself, the introduction of
the metal filament being responsible for the increased efficiency
that has placed electric lighting practically within reach of all.
In comparison with the advances made in filament construction
those made in the direction of scientific artificial lighting have
been small.
The formation of the Illuminating Engineering Society has
done much to create an interest in this important subject, while
further, the work of Government Commissions and the publication
of their reports on school, factory and library lighting has served
still more to impress people with the importance of adequate
illumination.
If good lighting is important in public institutions it is equally
if not more important in the home, and the approved methods of
disposing of the light units so as to avoid unnecessary glare and
produce an adequate illumination, as well as the judicious selection
of wall and ceiling coverings, should be fully understood by all
users and installers of electric light.
The existing literature on the subject is of too scientific and
technical a character for other than scientists, and in presenting
this treatise the author hopes that the obvious gap may be filled
and that the general reader may be assisted in deciding upon
the most suitable candle-power and distribution in his own
particular case.
The author has to thank Messrs. Siemens Bros, for information
concerning tantalum and permission to reproduce one of their
diagrams; Messrs. The General Electric Co. for information
concerning the drawing down of tungsten filaments; Messrs. The
Institution of Electrical Engineers for use of blocks illustrating
standard lamps; the American Illuminating Engineering Society
for permission to use blocks appearing in their Primer ; the editors
of the Electrical Review and Messrs. The British Thomson-
Houston Co.
To the latter company and to their lighting expert, Mr. R.
Eastman, his special thanks are due, for without their very generous
assistance in the matter of blocks and photographs the publication
of this work would have been almost impossible.
The author is indebted to Dr. Rhodes for proof reading and
valuable advice, to Mr. W. Hill for assistance with the sketches,
and to the publishers for the kind way in which they have assisted
in the production of this work.
DANIEL H. OGLEY.
ROYAL TECHNICAL INSTITUTE,
SALFORD.
CONTENTS
CHAPTER I. THE PRODUCTION AND PROPAGATION OF LIGHT
CHAPTER II. ILLUMINATION AND ITS MEASUREMENT
CHAPTER III. STANDARD LIGHT SOURCES
CHAPTER IV. PHOTOMETRY AND PHOTOMETERS
CHAPTER V. LIGHT DISTRIBUTION FROM INCANDESCENT SOURCES
CHAPTER VI. INCANDESCENT ELECTRIC LAMPS
CHAPTER VII. CHARACTERISTICS OF INCANDESCENT LAMPS
CHAPTER VIII. THE EYE AND THE PRINCIPLES OF VISION
CHAPTER IX. LIGHTING SYSTEMS (i) The Direct System
CHAPTER X. LIGHTING SYSTEMS (2) The Indirect System
CHAPTER XI. FURTHER ILLUMINATION CALCULATIONS
APPENDIX
INDEX
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