PREFACE.
TABLE OF CONTENTS.
LIST OF PLATES.
PART I. THE AURORA AND ITS CHARACTERS. CHAPTER I. THE AURORA AS
PART II. THE SPECTRUM OF THE AURORA. CHAPTER X. SPECTROSCOPE
PART III. MAGNETO-ELECTRIC EXPERIMENTS IN CONNEXION WITH THE
APPENDICES. APPENDIX A. REFERENCES TO SOME WORKS AND ESSAYS ON THE AURORA.
FOOTNOTES
AURORÆ:
THEIR CHARACTERS AND SPECTRA.
BY
J. RAND CAPRON, F.R.A.S.
“And now the Northern Lights begin to burn, faintly at first, like sunbeams playing in the waters of the blue sea. Then a soft crimson glow tinges the heavens. There is a blush on the cheek of night. The colours come and go; and change from crimson to gold, from gold to crimson. The snow is stained with rosy light. Twofold from the zenith, east and west, flames a fiery sword; and a broad band passes athwart the heavens, like a summer sunset. Soft purple clouds come sailing over the sky, and through their vapoury folds the winking stars shine white as silver. With such pomp as this is Merry Christmas ushered in, though only a single star heralded the first Christmas.”—Longfellow.
LONDON:
E. & F. N. SPON, 46 CHARING CROSS.
NEW YORK:
446 BROOM STREET.
1879.
ALERE FLAMMAM.
PRINTED BY TAYLOR AND FRANCIS,
RED LION COURT, FLEET STREET.
TO
Prof. CHARLES PIAZZI SMYTH, F.R.S.E.,
ASTRONOMER ROYAL FOR SCOTLAND,
ONE OF THE EARLIEST SPECTROSCOPIC OBSERVERS
OF
THE AURORA AND ZODIACAL LIGHT,
THIS VOLUME
IS
RESPECTFULLY DEDICATED
BY
THE AUTHOR.
