Improvement in Bottoms for Kettles, Saucepans, Bottom Vessels for Double Porringers, and like Boilers.

摘要

7866. Wilson, F. April 1. Heating - surfaces, increasing. - The bottoms of boiling - vessels such as kettles, saucepans, bottom vessels of double porringers, &c. have concentric and radial corrugations for distributing the heat, the radial corrugations opening out at the periphery of the vessel bottom as shown.