Olympus ST. HS Manuel d'instructions - Page 6

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IV Construction

1. Body tube

Body tubes can be classified as follows by form and function.

Fixed tube

Vertical tube

Monocular tube

Adjustable tube

Fixed tube

Binocular tube

(Trinocular)

Adjustable tube

The fixed body tube has a constant length, that is, the unchangeable distance between the eyepiece and the

objective. In Olympus biological microscopes the tube length is fixed at 160 millimeters. WHh a mechanical tube

length of 160mm.

the microscope is focused with a lOX objective and Ihen the nosepiece is turned to set a 40X

objective in place, it is also focused to such an extent that accurate focusing can be done only

operating the fmc

adjustment knob.

When the objectives are used on a body lube with a mechanical length other than 160mm, it will be impossible to

obtain Ihe rated magnifications, the resolving powers and the par-fol;alty.

2. Revolving nosepiece

It is customary for the objectives to be mounted on the nosepiece in

manner in which higher powers can be

obtained when the nosepiece is turned clockwise with the right hand while looking through the eyepiece.

3. Stage

Square fixed stage. Mechanical stage can be filled on HS, HSB and HSC.

4. Focusing mechanism

The coarse adjustment mechanism consists of a rack and a pin-

ion by which the body tube is racked up and down. Models HS,

HSB and HSC have double-lever fine adjustment mechanism.

Stopper

S. Body tube stopper

This stopper is used for preventing the body tube from sliding

down farther than a pre-set point. If the stopper is fastened

tightly when the body tube has been adjusted at a desired level,

the tube can be racked up and down only above the pre-set level

but never come down below it. 'This arrangement prevents a

damaging collision between the objective and the

~pecimen

the stage,

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