Zentmayer Modified Mount for Abbe Condenser

The mounting of this valuable apparatus is designed to be used conveniently with most English arid American stands provided with sub-stages. It is fitted into the substage. A rotating platform, provided with a pinion,carries a sliding plate with a rack engaging the pinion whereby eccentric movements may be given in addition to rotation. The Iris diaphragm is pivoted to the sliding plate, and may be swung aside to receive stops conveniently. The condensing system of 1.20 N. A. is sufflcient for all objectives of not greater numerical aperture. Beyond that, the condenser of 1.40 N. A. is necessary.

The Army microscopes made c.1876 and after incorporate the swinging substage described in the Zentmayer patent of  Aug. 15, 1876          

ZENTMAYER'S U. S. ARMY HOSPITAL MICROSCOPE

This Stand was originally designed and constructed for the United States Army, Medical Department, in 1862, but has recently been reconstructed. The Stand is 16 inches high when arranged for use. The body is of standard length, has rack and pinion for coarse adjustment; and a fine micrometer screw, acting upon a levers forms the delicate fine adjustment. The bar is supported by one stout pillar with joint to incline to any angle.

The sub-stage, which carries the accessories and the plane and concave mirror, swing in the same manner as in the American Centennial Stand, having the object as its centre, even when swung over the stage for illuminating opaque objects, thus making a bull's-eye unnecessary. The stage is similar to that of the American Centennial Stand, with the exception of the graduations It has complete revolution and is adjustable.

3126. United States Army Hospital Microscope, Binocular, with  One pair No. l Eye-pieces;          
One           do.                No. 2                do.          
One Object-glass, 8/10-inch focus, 32 degrees angular aperture;   
One       do.        1/4        do.         90 degrees      do.        do.          
Camera Lucida;
Stage Micrometer;
In upright polished mahogany case, with lock and key and brass handles ...... $173.00    
3127. Same as No. 3126, but Monocular, with two Eye-pieces .....................$133.00