MAGIC LANTERN WITH DIRECT CURRENT [Cn. I 



FIG. 15. 



LANTERN SLIDE IN PERMANENT WOODEN 

 CARRIER; ONE-HALF SIZE. 



/ Face view of the carrier and its slide. 



2 Sectional view of the carrier, showing the shelf on which the slide rests, 

 and the wire spring above. 



The slide is usually cut in circular form, and fitted into a circular opening 

 in the frame. A hole of the desired size is first made in the middle of the 

 carrier, but not going clear through ; then a slightly smaller hole goes entirely 

 through. This leaves a narrow shelf for supporting the slide. Above the 

 slide is placed a cover-glass, and then a wire spring to hold the glass in position. 



PROJECTION OF HORIZONTAL OBJECTS 



42. The ordinary magic lantern is in a horizontal position 

 (fig. i), but the lantern slide must then be vertical. Objects in 

 liquids, and some other objects cannot be put in a vertical position, 

 hence the necessity of a rearrangement of the lantern parts so that 

 the object may be placed horizontally. This is accomplished by 

 placing the second or terminal part of the condenser, in a horizontal 

 position, and the projection objective is made vertical. By means 

 of a plane mirror in the path of the beam of light from the first part 

 of the condenser, the light is reflected vertically upward. The 

 object is placed horizontally just above the second element of the 

 condenser. The vertical projection objective would give a picture 



