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40 MCINTOSH BITTER,' AND OPTICAL CO., CHICAGO, ILL., U. S. A. Dr. McIntosh Microscopic Attachment. For use with Solar or Artificial Light, for Projecting, or Photographing Microscopic Objects, with Oblique Illumination, or Projecting Opaque Objects. This attachment is constructed as follows: To the base plate of the Combination Stereopticon is clamped a triangular piece of brass U, by means of thumb screws; near its apex is a slot to hold the removable pillar I; this pillar is slotted on one side and has a screw and clamp G to hold the perpendicular pinion P, which in turn receives the stage and working parts of the Professional MlC ^,? SCO P e ® tanc *» which is clamped by means of the screw G. The stage and body tube of the Microscope can be raised and Wlth the screw The pinion P, in the pillar I, allows the Microscope to be rotated horizontally to the right or left. The center of an object on the stage corresponds with the center o motion. By means of this rotation, any angle, either of solar or artificial light, can be ohtained for photographing and pro- jecting, also projecting Microscopic objects, or projecting with transmitted light. This attachment can be connected with the solar instrument and adjusted the same as for artificial light. For photographing Microscopic objects, a camera box must be connected with the Microscope tube K. Price of Attachment “ Stereopticon McIntosh Professional Microscope “ Plain Microscope Attachment, to be used with ment Price, with! inch Objective $ 35.00 100.00 100.00 above attach- 25.00 45.00