Tar-lamp.
A lamp for burning tar for purposes of illumination.
The tar is contained in the cylindrical case, and flows from thence by a pipe to the burner, at whose summit it is ignited.
The supply-apparatus is on the fountain-lamp principle, and a chamber below the reservoir catches any overflow, which is drawn off by a faucet.
A jet of air is introduced through the center of the annular burner, having a pressure of 1 1/2 pounds to the square inch.
This is admitted at pleasure by a faucet below.
Without the central blast, a small lambent flame is obtained; when the compressed air is admitted, the tar burns with a vivid white light.
