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PREFACE
OUR aim in the preparation of this work on Optic Projection has been to explain the underlying principles on which the art depends, and to give such simple and explicit directions that any intelligent person can succeed in all the fields of projection; and our hope is that the book will serve to make more general this graphic art by means of which many persons can be appealed to at the same time and in the most striking manner. Furthermore we believe that this art has great, undeveloped possibilities for giving pleasure, arousing interest and kindling enthusiasm, in that it provides for the rapid demonstration of maps, diagrams and pictures of all kinds, the structure and development of animals and plants, many of the actual phenomena of physics and chemistry, and finally scenes from nature and from life, even with their natural motions and colors.
The authors have received most generous aid from many individuals and many manufacturers; and most loyal service from those who have helped to put the book in its present actual form.
Manufacturers have not only answered our numerous questions, but have put at our disposal valuable apparatus for experiment. They have also loaned us electrotypes of their apparatus.
We feel especially indebted to the Department of Physics of Cornell University for the help given by different members of the staff, and for the use of a research room and apparatus for the numerous photometric and other determinations required. Professor George S. Molcr of that department read over the manuscript, and gave us many valuable hints derived from his experience of over 40 years with all kinds of projection apparatus.
While we have both joined in the preparation of the entire work, each holds himself especially responsible for certain chapters as follows:
The senior author for 10 chapters (I-V, VII-X and XII).
The junior author for 5 chapters (VI, XI, XIII-XV).
SIMON HENRY GAGE, October 4, 1914. HENRY PHELPS GAGE.