In many investigations it is advisable to employ an analyzer introduced laterally into the tube, instead of the one mentioned above.
The following parts are supplied to complete the outfit: Triple nose-piece.
Eye-piece 0, with Bertrand's quartered quartz plate.
Eye-piece I with cross-lines, Brezina's Calcspath-plate, cleft perpendicularly to its axis, made to fit over eye-piece I, Klein's gypsum and quartz plates for insertion in the opening over the objective.
Price of the stand with these accessories =160.--=
38. =The same= with eye-piece III, objectives 1, 3, 5, 7. 1/12 Oil-Immersion, magnifications 18--800 =236.--=
The new mechanical stage No. 98 (See page 78) can be fitted to the stand for the purpose of investigating large preparations and serial sections.
39. The base and pillar are in one piece, neatly japanned black. The coarse adjustment is by rack and pinion.
The stage is revolving and graduated on the edge into 360 degrees. A pointer indicates its position.
The polarizer has stop at zeropoint and also marks at 90°, 180° and 270°. It is held in a spring-sleeve and the substage can be raised and lowered by lateral screw, or may be swung to one side. The condenser is mounted in separate arm above the polarizer and swings out of the optical axis by means of a lever, if parallel instead of convergent rays are desired.
The analyzer fits into an opening of the tube above the objectives and can be instantly thrown in or out of the optical axis. There is a slot below the analyzer for the insertion of quartz and gypsum plates.
By means of a collar with two centering screws attached to the end of the tube, the objective may be brought into the optical axis.
Price of this microscope with eye-piece I with cross-lines, Klein's quartz wedge and gypsum plate, red, I. order =$56.--=
40. =The same= with eye-piece III. and objectives 3 and 5.
=Dissecting Microscopes and Hand Lenses.=
[Illustration: Large Dissecting Microscope No. 41.]
Stand on heavy horse-shoe base, large stage with glass plate, adjustment by rack and pinion. The lens-carrier is movable for examining large plates. Illumination by movable plane mirror and white glass plate. Metal hand- rests covered with leather may be attached to the sides of the stage. They fit inside the mahogany case.