CONTENTS. 



Page. 



Introduction : 43 



Principles of photography of submerged objects, 43 



A new method of photographing submerged objects with camera above the surface 40 



Previous attempts to photograph submerged objects by means of a submerged camera 51 



Boutan's first apparatus 51 



Boutan's second apparatus 54 



Boutan's third apparatus 54 



Boutan's methods of artificial illumination 57 



Bristol's subaquatic camera 59 



A new subaquatic apparatus 00 



The camera CO 



The water-tight box ^ 62 



Using the apparatus C3 



Some limitations of subaquatic photography 06 



Literature cited 68 



42 



