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Bausch & Bomb Optical Company Projection Lenses —Two of our new Balo lenses with rack and pinion focusing 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 adjustable first surface mirror. Dimensions —Length, rear of lamp house to front of projection lens for lantern slides, 41 in.; height, 33 in. to top of mirror. Combined Balopticon with Moving Picture Attachment A very desirable projection equipment for schools, churches, Y. M. C. A.’s, etc., is the Combined Balopticon with an attachment for moving pictures, illustrated in Figure 3. In order that instant change may be made from the projection of opaque objects or lantern slides to moving pictures and back again, we have designed a special stand with cross-rods upon which the Balopticon is mounted and moved from side to side. When moved to the right, it lines up with the moving picture mechanism, permanently mounted on the table top. The lens for lantern slide projection is carried by an arm extending from the side of the moving picture mechanism. When the Balopticon is moved to the left, it lines up with this lens and is in position for the projection of lantern slides and opaque objects. Any one of the three makes of motion picture mechanisms (Powers, Edison or Simplex) may be fitted. The price of a complete outfit is the price of the regular Combined Balopticon, plus the prices of the moving picture mechanism and the special stand to accom- modate the same. If it is desired to add the moving picture attachment to the Combined Balopticon after purchase, this may be done by returning the instrument to the factory for the special fittings required. 57