61 / 230
PREVENTION
OF
INEQUALITY
OF
HEAT.
61
in
every
part
of
the
apparatus
which
they
may
fill
;
the
condensation
is
more
rapid^
and
the
products,
upon
the
whole,
greatly
superior.
To
render
this
instrument
still
more
useful,
its
lower
part
should
be completely
immersed
in
a
vessel
filled
with
cold
water
up
to
the
ball
;
the
liquor,
though
ever
so
little
impregnated
in
traversing
this
cold
fluid,
will
com-
plete
the
deposition
of
its
caloric.
This
precaution
will
also
prevent
the
losses
that
fre-
quently
result
from
the
negligence
of
the
workman.
Fig.
12.
Explanation
of
the
Cut.
—
A
B
c
B,
a
tube
of
copper
or
glass,
in
several
pieces,
bent
over,
with
a
ball
ii
eight
inches
in
diameter.
The
upper
end
of
the
tube
A
may
be
attached
to
the
worm
by
means
of
a
vice.
6
The
length