196 SCIOPTICON MANUAL. 



direction of the corresponding point in the image, while 

 reflected light spreads from each point in all directions. 



The Sciopticon, with its draw-front removed, happens to 

 be well shaped for shutting over the front end of the lan- 

 tern body holding the condensing lenses p and q, the open 

 end of the Megascope, which is shown in horizontal 

 section, as if looking down upon it. (Fig. 55.) The 



door D, hinged at the 

 shorter side, closes at an 

 angle to reflect the light in 

 the direction of the focus- 

 ing lens o, which in this 

 case is the Sciopticon ob- 

 jective screwed into a 

 duplicate flange. The 

 aperture in the middle 

 of this door, or Mega^ 

 scope stage, allows the ob- 

 mg. 55^ ject or carte de visite to be 



attached to the outside by springs, and does not prevent the 

 object or picture from being attached to the inner surface, 

 which is also provided with springs. 



Flame illumination has the peculiar advantage, in the 

 Megascope, of covering some two and a half inches at this 

 outer conjugate focus of the condenser, so that a portion of 

 the margin lost in the lantern is here available. The lime- 

 light makes at the focus a bright hot spot, sometimes 

 necessitating the drawing the Megascope forward, which 

 does not change the angles in relation to the lenses. 



The Megascope has greater advantages as an attachment 

 to the Sciopticon than as a separate apparatus, for the 

 illumination is better; it telescopes over the lantern body, 

 which is not in the way of the backward direction of its ob- 

 jective; it is simple and inexpensive, and what it can do for 

 us we have with the least possible trouble, and at its best. 



