Steam Heated Evaporator.

Patent for a new and improved steam-heated evaporator. This design consists in "[t]he combination of the receptacle, the chest inclosing the receptacle, the coil surrounding the chest, the vat containing the chest and coil, the pipe having branches communicating, respectively, with chest and coil, and cocks, for controlling the passage of steam to the chest and coil, and the pipe for condensing the vapor from the receptacle" (lines 60-68)