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B a u s c h & Lomb Optical Company NOTE — For classroom use, the 4^-foot screen may be considered too small, in which case we recommend the substitution of a 6x6-foot aluminum coated screen on spring roller, which may be secured with any of the above outfits for $6.00 extra. If the larger screen is desired, it should be so specified when ordering. For Mazda lamps on higher voltages we supply resistances (see “Accessories”). Special Equipment The Home Balopticon has been found very useful in Departments of English for projecting the compositions of students upon the screen, thus enabling the class as a whole to review and criticize them more readily. In order to pro- ject as much as possible of the entire composition at one time, we are prepared to supply the Home Balopticon on special order with an opening in the bottom of the dark chamber, 5% x 6 V 2 inches. This area permits the projection of an entire sheet of the composition paper generally used. The 5 Yv x 6 -inch area is the largest that can be projected with this apparatus, and we offer the suggestion that the compactness, simplicity and economy of the Home Balopticon, together with the excellent opportunities which it thus affords for criticism and class review, would many times offset any inconvenience occasioned by a necessitated change in size of composition paper. In order to project the large area with sharpness to the extreme edges, it is necessary to equip the instrument with one of our Balo projection lenses, which are of the highest quality. 49