Improvements in warming devices

摘要

In a slow-combustion warming device such as described in Specification 399,642, [Group XI], in which a volatile liquid fuel and air mixture is burnt without flame at a catalyst such as platinized asbestos, glass wool or slag wool, a small proportion of vanadium penttoxide is added to the catalyst to expedite combustion. Specification 490,442, [Group XI], also is referred to.