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PREFACE
THE collection of material of this work was begun over thirty years ago, but with no idea then of its being published. With the lapse of time the bulk of the notes became so great that it was necessary to boil them down into such form as would make them more readily accessible, with the result that it was finally decided to publish the work, which is but a resume of the literature collected.
The book has not been compiled for the dilettanti who may desire to turn out a few pretty things in color. For such the author's "Practical Color Photography" should provide the necessary pabulum. It is hoped that the work will be useful to the earnest student of color photography, who, desirous of seriously following up any particular line, wants to know what has been done and said by others.
It should be useful also to would-t>e inventors, as they may learn, if they will, as to previous patents, previous practice and the disclosures of those skilled in the art. There is, of course, a certain class of people and inventors, the latter especially, to whom this work will not be welcome, for in many cases it will prove that their latest ideas and inventions are not original, in fact, in some cases too obviously adoptions, to use a mild term, of other people's ideas and earlier suggestions. But to quote a wellknown writer : "in the testimony afforded by an array of mute facts there is neither possibility of collusion nor opening for fraud." The true investigator who starts out, primed with data as to what has been previously said and done in a particular subject, has a very advantageous handicap over him who commences de novo.
The author can at least claim that there is no work in any language which has brought together a history and summary of color photography, comparable to this book. It may as well be pointed out that this is only half the work, as the subjects of the Lippmann, Seebeck and Bleach-out processes have been dealt with in a similar manner. But such are the economic conditions at the present time that this other volume must lie on the shelf till someone is willing to pay for its being published.
In a book of this scope there must necessarily be errors of omission and commission, but extreme care has been taken to verify as far as possible every reference. In a few cases this has been impossible, mostly in the case of some of the early foreign journals, access to which has not been obtained. No attempt has been made to deal with the photomechanical reproduction of color, as this would entail considerable enlargement of the work, which has already attained sufficient bulk. This subject is left for another volume.