Projection Apparatus (1917)

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Bausch & Lomb Optical Company Convertible Balopticon Figure 1—Convertible Balopticon in Position for Lantern Slide Projection. The Convertible Balopticon is, in reality, what its name implies: convert- ible in every sense of the word. In its simplest form it is arranged for the projection of opaque objects up to 8x10/4 inches and of lantern slides with quick interchange from one to the other by the shifting of the lamp house (with arc lamp and condensing system) from the inclined to the horizontal position, and vice versa. This apparatus is constructed, like our other Balopticons, on what might be termed the unit system. To the base unit may be added other units or attach- ments for the projection of microscopic objects; projection of large transparent objects such as brain sections, X-ray plates, etc., held in a horizontal plane; projection of anatomical specimens in museum jars; projection with polar- ized light; projection of the spectrum and complementary colors; projection of motion pictures by a special construction. These attachments are so constructed that, with one exception, they can all be added to the base instrument, and the result is an apparatus complete for as many different forms of projection as may be desired—with instant interchange from one to the other. This quick interchange is of importance in any apparatus intended for use in the class room or laboratory, since it renders immediately avail- able a wide range of illustrative materials and permits one to cover a great deal of ground without delay or inconvenience. Furthermore, maximum efficiency is attained with all these different forms of projection. By this statement we mean that if we were to construct apparatus particularly designed for any one of the forms enumerated, no better results, for all practical purposes, could be obtained than those possible with the Convertible Balopticon. This unit system of construction, therefore, enables us to make up a combi- nation outfit that will meet any demand—from that of departments wishing to 68