The Gravity Bong

I was introduced to the gravity bong by a friend. He told me the full name
as described to him was the "Afghanistan Gravity Bong". We were sitting around
one night and decided to try one out.

While I could go into detail concerning the mechanics of the bong\'s
operation, I don\'t think that is really necessary. The reason it is called a
"gravity bong" and not something else is this is what someone called it, that is
how they described it to their friends, and now it is an accepted term for the
following setup. I have observed some people on the net arguing about gravity
vs. pressure vs. whatever. If you have comments like this as a result of this
description, I refer you to: alt.engineering.geeks. The type of argument I have
observed would have been halted a long time ago by declaring a "TECH TIME OUT
!!" at our school. Take a hit man. I feel better now having said all that,
so... on with the important stuff...

GRAVITY BONG OPERATION:

STEP 1:
Place the bottomless bottle into a water source such as a bucket of water,
sink, bathtub, larger bottle, fishtank (just kidding), etc...When the bottle
rests on the bottom, the mouth piece should be above the water level enough to
grip the bottle. I\'m not sure if warm or cold water is best, or even if it makes
much difference seeing as the smoke is not bubbled through it.

STEP 2:
Pack the bowl and place it on the mouth of the bottle.

STEP 3:
SLOWLY!! draw the bottle out of the water, while lighting the bowl. The
herb should really burn and the smoke will look intimidating. Stop when: a)the
herb is all ash (preferable), or b)when the bottom of the bottle is still an
inch or so below the water level in the bucket. Begin preparing yourself for a
huge hit.

STEP 4:
CAREFULLY remove the bowl without letting the bottle move downward (up a
little is o.k., but don\'t lwt the bottom come out of the water), exhale deeply,
and place your mouth over the opening. Inhale quickly and completely, allowing
your head to move downward. Try not to drink any bong water as this kind of
sucks! (although its like learning to swim, it\'s bound to happen a little).

STEP 5:
Don\'t cough and hang on tight!

PACKED
BOWL >> \$\$
I I I/I BOTTLE >> / BOTTLE
>> /
/ /
| / | | / |
|||| ||||
|||| ||||
||WATER|| ||WATER||
|||| ||||
|||| ||||
__________________/ __________________/
BUCKET BUCKET

Step 1 Step 2
/ = BOWL
% \$\$ = HERB
LIGHTER __ *% ** = LIGHTER FLAME
>> |__|@**
\$\$ SUCK
/ I/I ||
|| / . . || I..I
|| /. . . || /. .
|| /. . . . / /. . .
|. . . . . | /. . . . BOTTLE >| SMOKE |
|. . . . . |
| . . . . .| | . . . . .|
| || | | || |
|||| ||||
|| ||||
|WATER| |BONG|
|| |WATER|
|| ||
__________________/ __________________/
BUCKET BUCKET

Step 3 Step 4

THE DESIGN:

FIRST TRIAL:
First, a 2-liter bottle and a suitable bucket were obtained from the
apartment. I cut the bottom off the 2-liter bottle and set it aside. I was
able to find a couple of screw on caps, one of which was of the metal variety.
I cut a rough hole in each, and glued them together, with the cup sides facing
out. Into the side with the metal cap, a piece of screen was placed and fit
real nice. We were forced to build this little thing because we didn\'t have a
bowl handy.
This worked o.k., but quite a bit of air flowed in for the quantity of herb
which was consumed. Also, it was a pain to unscrew the cap after lifting the
bottle. Overall, we all ended up having a great time and the first trial was
still a success. I leave this historical description in here because: a)this
may be a good enough system for you, or b)you are also in a pinch for something
right away as we were!

SECOND TRIAL:
Having decided the activity was fun enough to warrant further development of
the gravity bong, and having access to a machine shop, I designed a bowl just
for this purpose. This incorporates a nice sized burn chamber (approximately =
to