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WIRELESS TRANSMISSION OF PHOTOGRAPHS

Fig. 10.

WIRELESS TRANSMISSION

OF

PHOTOGRAPHS

BY

MARCUS J. MARTIN

SECOND EDITION
REVISED AND ENLARGED 1919

THE WIRELESS PRESS, LTD.

12-13 HENRIETTA STREET, STRAND

LONDON, W.C. 2

{v}

PREFACE TO SECOND EDITION

Although during the last few years very little, in common with other wireless work, has been possible in connection with the practical side of the wireless transmission of photographs, yet, now that the prospect of experimental work is once again occupying the minds of all wireless workers, advantage has been taken of a reprint of this little volume to amplify a few points that were insufficiently dealt with in the first edition, and also to add some fresh matter.

To Chapter V. has been added a short description of the Nernst lamp, and also some useful information regarding photographic films, and a few notes relating to enlarging included in the Appendix B.

A fresh appendix dealing with the principles of optical lenses has also been added. This is a subject that plays an important part in any system of wireless photography, and to those experimenters whose knowledge of optics is limited this section should prove useful.

To serious workers engaged on the problem of the wireless transmission of photographs, attention {vi}is called to a series of articles which are being published from time to time in the Wireless World, on the design and construction of wireless photographic apparatus.

{vii}

PREFACE

In these progressive times it is only reasonable to expect that some attempt would be made to utilise the ether-waves for other purposes than that of telegraphic communication, and already many clever minds are at work trying to solve the problems of the wireless control of torpedoes and airships, wireless telephony, and, last but not least, the wireless transmission of photographs.