viii CONTENTS. 



THE CAMERA OBSCURA. 



PAGE 



1. Principle of the instrument. 2. Its inventor. 3. Method of 

 mounting it. 4. Application of the prism to it. 5. Mounting a 

 camera with prism. 6. Portable camera. 7. Form of camera 

 adapted to photography . . . . . . . 203 



Errata in Vol. VII. of "Museum of Science and Art." 



Page 43, line 8, for "February" read "April." 



159, 29, 



> 32, 



j? >5 35, 



36, 



162, 23, 

 170, 1, 



