A solar powered ceramic sculpture and scientific recording instrument invented by Clayton Bailey in 1992.

A large magnifying lens burns an arc across the wood plank each sunny day in Port Costa, California.

A large magnifying lens focuses the sunlight into a concentrated point which burns a thin, deep line into a 2" X 12" wood plank each day. Each day the new line is burned just above or below the previous day's line, as the sun's path across the sky raises or lowers with the changing season.

Clouds of smoke are emitted while this device is working.

A sunny day is represented by a continuous burned groove across the plank; a partly cloudy day by an intermittent groove, or one of varied depth. Rainy days leave a ridge of unburned material in the recording medium.

The wood plank is replaced twice a year, on each solstice.

No practical use for this data has yet been found, but Dr. Gladstone has collected the data since 1992.