i8o PROJECTION OF IMAGES OF OPAQUE OBJECTS ICn. VII 



FIG. 97. THOMPSON'S REFLECTOSCOPE, MODEL G-2, 1913. 

 (Cut loaned by A. T. Thompson & Co.). 



As here shown the instrument is ready for opaque and for transparency 

 projection. 



There are additional attachments by which microscopic projection can be 

 done with either a horizontal or a vertical microscope. There is also an 

 arrangement for placing the magic lantern objective in a vertical position, 

 and thus projecting horizontal objects. 



Commencing at the right : The lamp-house with arc lamp and condenser. 

 This is at an angle so that opaque objects in a vertical position are lighted 

 directly as in Chadburn's opaque lantern (fig. 92). In this case the screen 

 picture has the rights and lefts reversed. 



Above is the magic lantern objective for transparencies. 



Below is the large aperture, long focus projection objective for opaque ob- 

 jects. The objective is inserted in the dark chamber containing mirrors for 

 reflecting the light upward for transparency projection, or downward for the 

 opaque objects in a horizontal position. 



Above is shown a lantern slide in the carrier and below a book in a horizontal 

 and a picture in a vertical position. 



With the opaqt:e object in a horizontal position the light is reflected from a 

 mirror down upon the object, the light from the opaque object is then reflected, 

 in part, back to the same mirror and from the mirror out through the projec- 

 tion objective to the screen. The screen image in this case will be erect in 

 every way if properly placed on the holder. 



