The Brunton Furnace.

207. This furnace is essentially similar to the Bruckner, but has no diaphragm. In form it differs slightly, being ovoid, or egg shaped, the larger end toward the fire. This form must conduce to the stability of the brick lining, and is said to roast the ore more evenly than the cylinder. The rotation of the furnace is not produced, as in the Bruckner, by means of a pinion engaging in a toothed rack surrounding the shell, but simply by the traction of the rollers, two of which are connected by a strong shaft, to which motion is imparted by means of a screw on a transverse shaft. This, with the absence of the diaphragm, a low royalty for the patent right, and some other peculiarities, render the furnace cheaper than the Bruckner. A Brun-ton furnace twelve feet long by six feet eight inches in its greatest diameter, recently constructed for the chlorination works at the Plumas National Mine, in Plumas County, California, weighed, including gearing and iron bed-plates for the rollers, in place of the wooden ones formerly used, nearly 10 tons without the lining bricks.