CONTENTS OF MANUAL. 



Introduction, xi 



CHAPTFR I. 



The Camera Obscura 



The Inverted Image, 



Color and Shading, 



Motion, 



Size, 



Size on the Retina, 



Size in the Photographic Camera, 



Magnified Image, 



Inferences, 



Experimental Verification, 



Indistinctness, 



Convex Lens, 



Stops, 



CHAPTER II. 



The Corrections required by 



Lenses, 



The Form of Lenses, 



Pencils of Rays 



Spherical Aberration, 



Distortion, 



Curved Field, 



Chromatic Aberration, 



Unequal illumination, 



Corrections in the Eye, 



The Landscape Lens, 



The Portrait Objective, 



24 



CHAPTER III. 



The Construction of the Sciopti- 



con, 



No Loss of Light from using an 

 Objective of Low Power with 



a Concentrated Light, 24 



Advantages of Concentrated Light 25 



The Condenser, 26 



The Reflector, 26 



Various Modes of Lantern Illu- 

 mination 27 



The Size proper for the Illumin- 

 ated Di?c, 28 



Analysis of the Sciopticon 29 



Packing, 32 



Rules for Operating the Sciopti- 

 con 33 



Recapitulation, 36 



The Screen, 37 



Dissolving Views 39 



Directions for Producing the Dis- 

 solving Effect, 41 



The Phantasmagoria, 44 



Ancient Magicians, 45 



CHAPTER IV. 



50 



Picture Slides, 



The Standard Size for Lantern 



Slides, 51 



The Sealed Picture, 52 



Statuary, 53 



(vii) 



