Olympus ST. HSC 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.
if
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
by
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
3
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
on
the stage,
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