Projection Apparatus (1917)

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Bausch & Lomb Optical Company Condensing Lenses Because of the quality of glass used and the superior workmanship our con- densing lenses are considered standard. They are carefully annealed and finished. Although our patent, ventilated mount (see page 19) minimizes the danger of breakage, yet with all possible care condensers are still liable to break and it is well to have an extra set at hand. 101