1 92 PROJECTION OF IMAGES OF OPAQUE OBJECTS lCn. VII 



FIG. 107. BAI.OPTICON FOR THE PROJECTION OF LARGE OPAQUE OBJECTS. 



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



This opaque projector is especially designed to show large objects and large 

 surfaces (20 inches, 50 cm. square). To avoid shadows in projecting machines 

 and other solid objects, and to supply the needed illumination there are two 

 25 ampere lamps tilted to throw their light directly upon the two opposite 

 sides of the object. Each lamp has its own rheostat and table switch. 



