Projection Apparatus (1917)

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Bausch & Lomb Optical Company Medium Microscope This is a compound microscope de- signed for use with our Model D, Universal and Convertible Balopticons. It has coarse and fine focusing adjust- ments, the former by diagonally cut rack and pinion with a long range and the latter by our lever type of adjust- ment. The stage measures 4/4 x 3^4 inches and gives a distance of 3/4 inches from its center to the base of the arm. It has a substage condenser with iris diaphragm, mounted in a threaded sleeve for focusing. A substage water cell can be fitted at extra cost as indicated in the price list. For use on the Universal Balopticon, the microscope is supplied in addition with a 424-inch diameter condensing lens which utilizes the beam from the large projection lens. Low power objectives, as well as high power, can be used on this microscope without eyepiece. The eyepiece tube is removable and the body tube is 2/4 inches in diameter, so that the entire available field of the Micro-Tessars is utilized. The instrument is finished in dull black. The microscope is mounted on a swinging arm by which it may be thrown out of the optical axis and permitting instantaneous interchange between micro- scopical and other forms of projection. In the case of the Convertible and Model D Balopticons, the microscope and lantern slide projection lens are mounted on this arm parfocally, so that one is swung out of the optical axis and the other swung in by the same movement, no adjustment of the light source or condensers being necessary. 112