This movement extends in exact ratio to the revolution of the cam for a distance of 3 mm. As another advantage we may mention, that it is almost impossible to break the coverglass of the specimen with this fine adjustment.
Should the objective come in contact with the coverglass and assuming the knob is turned still further then the tube, which is of aluminium and very light would simply rest on the specimen, without breaking the coverglass, as the latter will easily stand the small pressure of the tube and the fine spiral spring.
1. New microscope stand "A" inclinable with hinged joint and clamping lever, fitted with round revolving centering stage, coarse adjustment by rack and pinion, new fine adjustment by micrometer-screw (each division 1/1000 mm.) Wide tube, draw tube with millimeter scale. Large illuminating apparatus with swing-out condenser and cylinder-iris diaphragm =120.--= Apochr. 16, 8, 4, oil-imm. 2 mm. N. A. 1,30 =204.--= Compens. ocular 4, 8, 12, 18 =34.50= Compens. ocular No. 6 with micrometer and drawing ocular No. 93 =18.50= Large mechanical stage No. 99, for object slides up to 2×4 inches =32.--= Triple nose-piece =8.--= ------------ Magnif. 70--2250. =417.--=
2. The same stand and illum. apparatus; Object.: 2, 4, 6, oil-imm. 1/12, N. A. 1,30 Ocul. 0. I. III. IV. V. microm. ocul. II. Triple nosepiece =210.--=
3. =Large microscope=, inclinable, with hinged joint and clamping lever and fitted with round revolving centering stage. Coarse adjustment by rack and pinion, new fine adjustment by micrometer-screw, the head of which is graduated each division = 1/1000 mm. Draw-tube with (see page 25-26) millimetre scale. Large illuminating apparatus with swing-out condenser and cylinder iris diaphragm (illustrated on page 21). Mechanical stage, No. 98. Triple nose-piece. Drawing eye-piece, No. 93. Micrometer eye-piece, No. 84. Achromatic objectives Nos. 1, 3, 6. Oil-Immersion 1/12, N. A. 1,30. Eye-pieces 0, I, III, IV, V. Magnifications 12--1300 =236.--=
4. =The same= stand and illuminating apparatus. Triple nose-piece. Micrometer eye-piece, No. 84. Drawing eye-piece, No. 93. Objectives 2, 4, 6, Oil-Immersion 1/12, N. A. 1,30. Eye-pieces I, III, IV, V. Magnifications 33-1300 =210.--=