hey
everyone when I was a kid I always
liked these Christmas tree
bubble lamp
ornaments and they showed
up again in my
life when my dad bought a
Wurlitzer
jukebox there at the side
of the jukebox
on that model so I thought
I'd have a go
at making one myself the
bubble lamp
consists of a sealed glass
tube with
some methylene chloride
inside the tube
and a heat source at the
bottom which is
usually a light bulb and
the top of the
tube is just out in free
air which is
how the heat dissipates
from the system
this works because
methylene chloride is
a very low boiling point
solvent the
boiling points about 40
degrees C so
down here it's actually hot
enough for
the solvent to boil and
then as the
vapor bubbles travel up the
solvent up
here is lower than the
boiling point so
the solvent bubble actually
dissolves
back into the fluid it's
kind of cool
because the bubble doesn't
just reach
the surface and then pop it
it actually
gets smaller and smaller
and kind of
dissolves away before it
even hits the
surface
I built this by taking
apart a standard
squeeze ball pipette and
melting the tip
of it shut and I put the
tip in some
fiberglass insulation to
keep it from
cooling down too quickly I
don't really
know what kind of glass
this is but just
to avoid you know cracking
and stress as
I figured I'd cool it down
as slowly as
possible I filled the tube
up about 3/4
full with methylene
chloride and then
sealed the top up
unfortunately glass is
a very poor conductor of
heat so I was
able to seal the top
without actually
boiling the methylene
chloride because
that would make sealing it
very
difficult
I had to experiment with a
couple
different combinations of
light bulb and
aluminum foil to get enough
heat into
the bottom of this
currently this is a
25 watt light bulb tungsten
and I've
covered most of it up with
foil and to
concentrate the heat on the
tube there
these lamps may have gone
out of favor
because the methylene
chloride is a
fairly nasty solvent as it
turns out
most you know low boiling
point solvents
are also fairly aggressive
so if you
spilled one of these tubes
open in your
house it might you know ruin
your carpet
or or ruin your floor or
give you cancer
or whatever and so you know
I can see
why they don't sell these
anymore quite
much too bad they're pretty
awesome
lamps okay see you next
time bye
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