PROJECTION MICROSCOPES ON THE MARKET [Cn. IX 



FIG. 175. MODEL 4-5 DELINEASCOPE WITH THE MICROSCOPE IN A VERTICAL 

 POSITION* FOR HORIZONTAL OBJECTS. 

 (Cut loaned by the Spencer Lens Co.). 



This figure is to show the course of the rays for lantern slides in a vertical 

 position and for microscopic objects in a horizontal position. 



A mirror M reflects the light vertically through the horizontal specimen, and 

 by means of a prism (PR) in the tube of the microscope the vertical light is 

 made to extend out horizontally to the screen. 



A joint in the microscope frame makes it possible to turn the microscope 

 down in front of the instrument after turning the lantern-slide objective aside 

 on its hinge. Then vertical objects can be projected in the usual manner, or 

 by using the prism (PR) the image can be reflected down upon a horizontal 

 drawing surface. 



