z
o
I-
~
0::
UJ
(/)
Q)
o
Fig.
26
II
locking
of
the pre-focusing lever
This
lever
(I)
is
jJrovided
to
prevent possible
conlact
between speci,
men arid
objeclive
as
well
as
to
simplifv
coarse locusing The
le~'€'r
is
locked in the
direction
of
the
arrow
in Fig.
26,
after
coarse focus
has
been
cC'o
plished,
Thi~
l<.
convenient for
liquid
apol
cation or
change
of
specirnens, roo. since it' prevenl5
further
upward lravel
01
,he stage bV means
oj
the
coarsl3
adjUst ent knobs, and provides a
I'rnitlng
stop
if
the
St;:ly8
is lowered and then raised again. The
pTe-
focusing lever does not restrict
fin.e
foCUsing.
*
Unlock
this lever
when
not
in
use.
If)
Use
of
immersion objectives
1)
To
utilize
the full numerical aperture
of
an
irnmersion objective
[wilh
inscription
"oil"),
the
ob~ec;tive
alld
spEo:cim
n
i:!re
Imr'llSHed
in an
im-
mersion oil in a
lollowing
procedure:
2) Focus on the specimen
with
a
low
power objective.
3)
Put a
drop
of
immersion oil on the sJ:ecimen slide and the
front
lens
of
the immersion objective.
4}
Turn
the nosepiece
to
bring the immersion objeclive inlO the
light
path,
and focus
'I,-,ith
the Hne
adjuslment
knobs.
* Use of
the
pre·focusing
lever facilitates
steps
2)
through
4)
above.
* Care
should
be
taken
to
prevent
oil
bubbles
from
forming
in
the
oil
film; jf
any.
re-apply
immersion
oil, since
these
bubbles
greatly
deteriorate
the
lens
performance.
*
Be
careful
not
to
stain
other
objectives
with
immersion
'oil,
and
after
use,
carefully
wipe
off
the
immersion
oil
on
the
objective,
etc.
completely.
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