Apparatus to focus human body heat for the purposes of cooking potatoes, 1930

I wonder if the "scientists" in this Feb, 1930 Modern Mechanix article ever actually built the potato-cooking apparatus shown here, or whether it was purely for illustration purposes.

SCIENTISTS have learned that our bodies are living machines of the combustion type in which the burning of fuel (food) is accompanied by the consumption of oxygen, liberation of heat energy and production of carbon dioxide as is the case in all combustion engines. Scientists find that the heat from a single person, if properly focussed, would be sufficient to cook potatoes.

Your Body Heat Is Sufficient to Cook Pan of Potatoes (Feb, 1930)