Method for manufacturing lid for cooking pot utilized for cooking in open fire, involves attaching magnifying glass or convex lens as burning glass, and adjusting glass or lens in height so that focal- and arc spots are fixed in cooking pot

摘要

The method involves attaching a magnifying glass or convex lens as a burning glass. The magnifying glass or convex lens is adjustable in height so that a focal spot and an arc spot are fixed in a cooking appliance i.e. cooking pot.