356 



MAGNIFICATION OF DRAWINGS 



[Cn. X 



FIG. 200. COMBINED DRAWING AND PHOTO-MICROGRAPHIC APPARATUS 



OF THE BAUSCH & LOME OPTICAL COMPANY FOR USE ON THE 



HOUSE LIGHTING SYSTEM. 



(Cut loaned by the Bausch & Lomb Optical Co.). 



This is a kind of universal apparatus serving for drawing with the microscope, 

 projection with a microscope and with a magic lantern; opaque projection, 

 and finally for photographing with all objectives and with the microscope. 

 It can be used in a horizontal, an inclined or a vertical position. For 

 drawing with the microscope in a horizontal position there is an adjustable 

 drawing shelf with a cloth tent for shutting out daylight in a light room. 



The large condenser enables one to use the apparatus on specimens of all 

 sizes up to lantern slides. 



510. Scale of diagrams or drawings made with the opaque 

 lantern. If one uses the episcope or opaque lantern, or a photo- 

 graphic camera for drawing, it is very easy to get the exact magnifi- 

 cation of the drawing by putting a metric rule upon some part of 



