These gravitators were made of MotoMaster resin usually used for making automotive body repairs. From outward appearances they are 12"x3"x3" solid blocks of resin with a wire sticking out from each end.

They were made by first using a mold to make a .5 inch thick block of resin. The mold was made using 1/8 inch thick plastic for the sides and an aluminum plate for the base, all taped together with black electrical tape.

Once the resin block was complete, a hole was then drilled through the center to admit the electrode wire. A wire was then soldered to an electrode plate. The wire was then put through the hole and a little resin was put on the block around the hole. The plate was then gently pulled down onto the still wet resin and the whole thing allowed to dry.

Electrode glued to end piece - rear view

Electrode glued to end piece - top view

After two such end pieces were made, the aluminum plate base of the mold was then removed leaving just the plastic sides. The sides were taped to near the top of the resin blocks so that together they formed a new mold and the building up of layers began.

Note that only thin layers of 1/8 inch or so were poured at a time since as the resin dries it produces a lot of heat. Too much heat and it melts the plastic mold and make a convex bowl-like surface with convex sides too.

Two end pieces beginning buildup

Due to resin's toxicity, this construction was all done in a specially built Resin Construction Unit ;->.

Resin Construction Unit

Eventually enough layers were built up to make two 6 inch halves.

Completed two halves

The two halves were joined.

Joining the two halves

Next, a thin layer (about 1/8 inch thick) of parafin wax was poured onto the sides for extra insulation.

Joined halves	Pouring wax
Completed waxed gravitator

Done.