With Numerous Illustrations.

REPRINT OF NEW AND REVISED EDITION,

With an Illustrated Appendix on the Use of Gyrostats.

LONDON
SOCIETY FOR PROMOTING CHRISTIAN KNOWLEDGE,
Northumberland Avenue, W.C.; 43, Queen Victoria Street, E.C.
Brighton: 129, North Street.
N e w Y o r k: E. S. G O R H A M.

1910

PUBLISHED UNDER THE DIRECTION OF THE GENERAL LITERATURE COMMITTEE

[Date of last impression, April 1908]

This Report of an Experimental Lecture
WAS INSCRIBED TO
THE LATE
LORD KELVIN,
BY HIS AFFECTIONATE PUPIL, THE LECTURER, WHO
HEREBY TOOK A CONVENIENT METHOD OF
ACKNOWLEDGING THE REAL AUTHOR OF
WHATEVER IS WORTH PUBLICATION
IN THE FOLLOWING
PAGES.

PREFACE.