Fig.2 shows a home kerosene lamp having exhaust-gas pipe(right side illustration), installed with ZnSb/constantan thermoelectric elements, is attached to the upper part of the lamp where combustion exhaust gas is going out. Large cooling fins are fit to this exhaust pipe so that a temperature difference is given to the thermo-elements to generate electricity. I incidentally have seen this type of lamp like in Fig.2 in the showcase of Leonardo da Vinci Museum in Milan, Italy. At the time this lamp was used, Soviet Union introduced thermoelectric generation into their 5-year plan in 1940s to effectively utilize domestic resources. In this activity, they operated 200-500W thermoelectric generator as "a generator in the cold regions" using combustion heat of firewood, gasoline and kerosene in the northern district. The Soviet Union was obviously an advanced country in thermoelectric generation