The science and art of medicine.

IN this outstanding 2"x2" Slide Projector, Bausch & Lomb has utilized the experience gained in manufacturing motion picture optical systems to give the user screen images of professional quality from black and white or color slides. Despite the exceptional brilliance of the screen images, slide temperature is kept within safe limits for all normal projection. The Bausch & Lomb 2"x2" Slide Projector is equipped with an f :3.8 projection lens and a large diameter triple lens condensing system, the back lens of which is of special heat absorbing glass. For complete description send for Bulletin E-1 16. Bausch & Lomb Optical Co., 642-4 St. Paul Street, Rochester 2, N. Y.