i6o 



OPTICAL PROJECTION 



one I am aware of, constructed on sound principles, was 

 planned and carried out by Messrs. Newton & Co. for the Santa 

 Clara College of California, on the plan represented in fig. 86, 



FIG. 86. Tri-unial Electric Lantern 



and shown in ground plan, with its lamp, in fig. 87. Here the 

 three nozzles (which in this case carried a projection -microscope 

 capable of 5,000 diameters, a diagram front, and an optical 

 front with all the usual accessories) are arranged at equal 



