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Bausch & Lomb Optical Company Model B Equipment for Enlarging and Lantern Slide Making Figure 4—Model B Outfit Set up for Enlarging (with Mazda Lamp). We have devised a set of accessories by means of which the Model B Bal- opticon can be readily converted into an efficient enlarging lantern, or a camera for making slides, as desired. Since the Balopticon is always readily available for projection work, one obtains three complete outfits in one apparatus by adding these accessories to his regular Model B. Amateur photographers can thus make enlargements of their negatives, they can make lantern slides as well and project the slides—all with one apparatus. Negatives up to 4 x 5 inches may be used, although the area that can be covered is limited to approximately 4 inches in diameter. For enlarging the outfit is set up as illustrated above. The sensitized paper is attached to the easel and the Balopticon moved on the tracks to the proper dis- tance for making an enlargement of the desired size, the negative being placed in the special holder which is substituted for the lantern slide holder on the Bal- opticon. Lantern slides can be made from negatives up to 5 x 7 inches in size. The lamp house of the Balopticon is attached to the back of the easel board, the central portion of which is removed to take the negative frame, the special frame carrying the plate holder taking the place of the regular slide holder, while the former with bellows and lens is set up the same as for enlarging. A special circular describing more fully these accessories and their use will be sent upon request. 24