Projection Apparatus (1917)

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Bausch & Lomb Optical Company Figure 2—Model B with Baby Arc Lamp and 4>4-Ampere Rheostat. Projection Lens —Special achromatic lens of 10-in. focus in spiral focusing mount regularly supplied; either 8-in. or 12-in. focus lens can be furnished without extra charge. Dimensions —Length (ready for operation), 20 in. over all with arc, or — in. with other lamps; height 9 Y\ in. Weight —Complete in case, 13-15 lbs., depending on equipment. Case— Sheet metal, 7% x 9^ x 15 in., lacquered in black; with carrying strap. With Mazda Lamp 22