home *** CD-ROM | disk | FTP | other *** search
- From: stormoen@sparc.isl.net (Stormoen MD)
- Newsgroups: alt.drugs
- Subject: Lava Lamp Plans Here.
- Date: 13 Jan 1995 08:08:15 GMT
- Message-ID: <3f5cdf$jun@news.isl.net>
-
- I've had SEVERAL requests for the plans, so here they are.
-
- Sorry, I guess I lost the name of the guy who gave 'em to me.
- (I recieved two versions, and I liked this one best).
-
- WARNING!! This electronic document deals with and involves subject matter
- and the use of materials and substances that may be hazardous to health
- and life. Do not attempt to implement or use the information contained
- herein unless you are experienced and skilled with respect to such subject
- matter, materials and substances. The author makes no representations as
- for the completeness or the accuracy of the information contained herein
- and disclaim any liability for damages or injuries, whether caused by or
- arising from the lack of completeness, inaccuracies of the information,
- misinterpretation of the directions, misapplication of the information or
- otherwise.
-
- Please note: The information contained in this electronic document can
- be found in the 1992 Edition of Popular Electronics Electronics Hobbyists
- handbook, published annually by Gernsback Publications Inc, USA.
-
-
- Inside a lava lamp are two immiscible fluids. If it is assumed that fluid 1
- is water, then fluid 2 must be:
-
- 1) insoluble in water;
- 2) heavier than water;
- 3) non-flammable (for safety);
- 4) non-reactive with water or air;
- 5) more viscous than water;
- 6) reasonably priced.
-
- Furthermore, fluid 2 must not be:
-
- 1) very poisonous (for safety);
- 2) chlorinated;
- 3) emulsifiable in water (for rapid separation).
-
- In addition, fluid 2 must have a greater coefficient of expansion than
- water. Check a Perry's handbook of Chemical Engineering, and the above
- list eliminates quite a few possibilities.
-
- Here is a list of possible chemicals to use:
-
- 1) benzyl alcohol (sp.g. 1.043, bp 204.7 deg. C, sl. soluble);
- 2) cinnamyl alcohol (sp. g. 1.04, bp 257.5 deg. C, sl. soluble);
- 3) diethyl phthalate (sp. g. 1.121, bp 298 deg. C, insoluble);
- 4) ethyl salicylate (sp. g. 113, bp 233 deg. C, insoluble).
-
- If desired, use a suitable red oil-soluble dye to color fluid 2. A
- permanent felt-tip pen is a possible source. Break open the pen and put
- the felt in a beaker with fluid 2.
-
- It is recommended to use benzyl alcohol as fluid 2. (Caution!! Do not
- come into contact with benzyl alcohol either by ingestion, skin, or
- inhalation.) In addition to water, the following items will be necessary:
-
- 1) sodium chloride (table salt);
- 2) a clear glass bottle, about 10 inches (25.4 cm) high;
- 3) a 40 watt light bulb and ceramic light fixture;
- 4) a 1 pint (473 ml) tin can or larger;
- 5) plywood;
- 6) 1/4 inch (0.635 cm) thick foam-rubber;
- 7) AC plug with 16 gauge lamp wire;
- 8) hardware;
- 9) light dimmer (optional);
- 10) small fan (optional).
-
- The performance of the lava lamp will depend on the quality of the water
- used. A few experiments must be conducted to determine how much sodium
- chloride is necessary to increase the water's specific gravity. Try a 5%
- salt concentration first (50 g of salt to 1 liter of water). Pour the
- red-dyed benzyl alcohol mixture in a Pyrex beaker. Add an equal or
- greater amount of water and heat slowly on a hot plate. If the benzyl
- alcohol floats to the top and stays there, decrease the salt
- concentration. If it stays at the bottom, add more salt.
-
- Construct the lamp by fastening the ceramic lamp fixture to a 5 inch (12.7
- cm) diameter piece of plywood. Attach the lamp wire to the fixture.
- Screw in the 40 watt bulb. Cut one end off the tin can, remove its
- contents, and clean thoroughly. Drill a hole in the tin can for the wire
- to go through. Invert the can over the bulb (open end down) and affix to
- the plywood with epoxy. Cut a round gasket from the foam-rubber and fit
- it into the top lip of the can.
-
- Fill the bottle partially with brine, add about 150 ml of benzyl alcohol,
- then fill up the bottle with brine. Leave about 1 inch (2.54 cm) of
- airspace on top for expansion. Bubble size will be influenced by amount
- of air space. Tightly cap the bottle and place on gasket.
-
- The light dimmer is used to control the amount of heat in the bottle. It
- is helpful if the bottle is too short and the 40 watt bulb makes the
- benzyl alcohol accumulate at the top.
-
- The fan can also be used to cool the top of the bottle and help the benzyl
- alcohol to sink to the bottom.
-
- If desired, add a trace of an antioxidant such as BHA or BHT to the brine
- to add color and contrast.
-
- Enjoy and good luck.
-
-
-
-
-
-