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Bausch & Lomb Optical Company Model G Balopticon Figure 1—Model C Balopticon with Arc Lamp. The Model C Balopticon, on account of its high degree of efficiency, adapt- ability to varying requirements and ease of manipulation, has proved itself to be a most satisfactory lantern for general use in the graded school, high school and university where an inexpensive but thoroughly high grade lantern for lantern slide projection is desired. It is, of course, equally desirable for general illustrative work in the church, Y. M. C. A. or lodge. Another feature of the Model C is that it accommodates attachments for the projection of opaque objects and for projecting transparent objects held in a horizontal plane, as well as the simple microscope attachment. The body of the lantern is made of heavy sheet metal, the different parts being stamped out by special forming tools. This provides for an instrument of light weight, but at the same time one of the required rigidity. Figure 2—Model C Balopticon with Gas-Filled Mazda Lamp, Two styles of lamp houses are offered : the small lamp house, Figures 1 and 2, and the large light-tight, or Underwriter’s Model, lamp house, Figure 3. The latter meets the requirements in every way of the Boards of Underwriters and is especially recommended where more than 15 amperes of current are to be used or where an opaque attachment is to be operated, as this style of lamp house entirely shuts off all the rays of light which would otherwise affect the brilliancy of the picture on the screen. We list this instrument with four different illuminants : the arc lamp, gas-filled Mazda lamp, acetylene burner and oxyhydrogen burner, all of which are provided with the same type of base so that they are readily interchangeable in the lamp house. 27