Microscopes and Accessory Apparatus Part 7

=Stand V.=

23. =Small Microscope=. Adjustable by sliding tube and micrometer-screw. Concave mirror.

Objectives 3, 7.

Eye-pieces I, III.

Magnifications 60-450 =30.--=

24. =The same.= Objectives 3, 5.

Eye-pieces I, III.

Magnifications 60-250 =28.--=

25. =The same.= Plane mirror.

Objectives 1, 3.

Eye-pieces I, III.

Magnifications 18-80 =24.--=

26. =The same.= Objectives 3.

Eye-pieces I, IV.

Magnifications 60-105 =18.--=

27. =Stand= without objectives and eye-pieces =8.--=

[Ill.u.s.tration: Stand VI.]

28. =Auxiliary Laboratory Stand=, for the examination of trichinae and for searching plate cultures. Very large stage (3-1/24 inch.). Adjustable by means of a carefully constructed rack and pinion, rendering it possible to focus objectives of fairly high power.

=Stand=, without eye-pieces, objectives or case =8.--=

29. This stand fitted with objective 3, eye-pieces 0 and IV. Magnifications 40 to 100, in mahogany case fitted with lock =18.--=

29a. =The same stand= fitted with eye-piece II and objective having separable front lens, yielding a magnification of 40 and 100 diam =18.--=

=Gla.s.s compressor= with graduation =--.80=

=Gla.s.s compressor= without graduation, per pair =--.40=

=Demonstration microscope.=

[Ill.u.s.tration: Demonstration microscope with condenser.]

30a. Adapted for low and medium power. Square stage with wheel-diaphragm.

Adjustment by sliding tube; after being adjusted the tube may be fixed by a ring clamp. Detachable handle.

With clip to hold a sketch or label, etc. Stand without objective and eye-piece. =6.--=

30b. =The same= with objective 3 and eye-piece I, magnifying 60 times =14.--=

30c. =The same= with adjusting screw for focussing high power objectives, with condenser and iris-diaphragm, without objectives and eye-pieces =18.--=

30d. =The same= with objectives 3 and 6 and eye-piece I.

Magnifications 60 and 255 =38.--=

[Ill.u.s.tration: Nebelthau's Sliding Microscope.]

=Nebelthau's Sliding Microscope.=

(Cf. Zeitschrift fur wissenschaftliche Mikroskopie, XIII, 1896.)

31. The sliding microscope is an instrument by means of which very large microscope sections, as, for example, large sections of the brain, can be systematically examined. It is also of service in looking over plate cultures of bacteria.

The microscope is carried on a heavy beam supported by two stout pillars under which the stage moves. The various movements are accomplished by motion of the microscope on a lateral track upon its support and by motion of the stage on a similar track at right angles to the first. The motion of the microscope is by means of a screw, that of the stage by double rack and pinion. The extent of the movements is indicated in each case by a scale, thus permitting the systematic examination of the entire specimen.

The stage consists of a gla.s.s plate, measuring 1620 cm, which is carried in a frame supported on four columns. The tracks permit a motion of the microscope of 18 cm and of the stage of 13,5 cm. A mirror under the stage affords ample illumination.

The microscope tube is so arranged that it can be easily removed from the stand and a simple lens subst.i.tuted for it. The coa.r.s.e adjustment of the microscope is by rack and pinion. A screw above the objective serves for fine adjustment. The price of this sliding microscope, without objectives or oculars, but with a lens holder and simple lens magnifying eight diameters is =80.--=

=Flat gla.s.s dish= of the same size as the stage to hold very large sections for the purpose of examining them while in clearing fluid =1.25=

[Ill.u.s.tration: Dolken's Microscope stand.]

32. =Dolken's Stand.= (p. 52) The stand is larger than Stand No. Ia, but is modified as shown in the cut so as to permit the examination of unusually large preparations. It is provided with the illuminating apparatus b (p. 22) and with all the adjustments necessary to the use of high powers.

=Stand= and illuminating apparatus, without nose-piece =80.--=

[Ill.u.s.tration: Travelling Microscope No. 33.] $

33. =Travelling Microscope.= This microscope is ready for use after spreading the foot, drawing out the tube and setting the mirror and stage in position. It is provided with all the adjustments of Stand No. V, consisting of fine adjustment by micrometer-screw, coa.r.s.e adjustment by rack and pinion and illuminating apparatus d (p. 22).

The box is arranged so as to accommodate three objectives and two oculars. It locks, has a handle, and measures 25157 cm, the whole apparatus weighing 5 pounds.

Price of this microscope with illuminating apparatus, but without objectives or oculars =32.--=

=The same=, without illuminating apparatus =24.--=

[Ill.u.s.tration: Large Travelling Microscope No. 34.

(Size of mahogany case 28198 cm.)]

This instrument (in size like the Ib.) combines all the essential features of a large laboratory microscope with a folding stand. It will be found invaluable on scientific expeditions, for research work etc.

When lifted out of the case, spread the two parts forming the base, which are then held by a spring-catch. After raising the tube, turn the stage around and tighten it by means of a lever. It is supplied with large Abbe condenser and Iris diaphragm adjustable by side screw. Coa.r.s.e adjustment by rack and pinion, fine adjustment by micrometer-screw.

Graduated draw-tube. The stand has joint for inclination.

[Ill.u.s.tration: Large travelling microscope No. 34 (set up).]

34. =Stand= with Abbe Condenser and Iris-Diaphragm, double nose-piece =66.--=

35. =The same=, with objectives 3, 6, Oil-Immersion 1/12", N. A. 1,30. Eye-pieces I, III. Magnifications 60-800 =128.--=

[Ill.u.s.tration: Horizontal-Microscope.]