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Bausch & Lomb Optical Company Condensing System —Oar regular double system, consisting of two plano- convex lenses, 4 Vo. in. in diam., mounted at the front of the dark chamber, for lantern slide projection only. Object Holder —Square plate of sheet metal; held against opening in bottom of dark chamber by arm actuated by two strong springs; accommodates objects of varying thicknesses and automatically brings them into proper plane for pro- jection; opening in plate at bottom of dark chamber permits area, 6 in. square, to be projected; removal of plate gives 6 x 7-in. opening. *Slide Carrier —Our double carrier, No. 4430, with elevating device. Post Card Carrier — Fwo adjustable carriers with wooden frames, which slide in object holder. Projection Lenses Two of our new series of Balo lenses, especially corrected to give a brilliant, flat field with the Mazda lamp; provided with rack and pinion adjustment; of such relative foci as to project images of approximately equal size from opaque objects and lantern slides; lens for opaque objects fitted with first-surface mirror to direct light to screen and cause picture to appear in proper position from left to right. Dimensions —Length, rear of lamp house to front of lens for lantern slide pro- jection, 27 in.; height to top of mirror, 33 in. *The quick-changing slide carrier, No. 4449, giving a dissolving effect, may be sub- stituted for $1.50 extra. N. B.—For those wishing to project autochrome slides with the above apparatus we recommend particularly the CRM-18 outfit, but with a special arrangement of the condensing system to increase the illumination and the substitution of a 2%e-in. diam., 10-in. focus pro- jection lens for the 1%-in. diam. lens regularly supplied. These changes will be made on special order at an extra charge of $10.00. 53