This historical Master Berthold, who would not have invented gunpowder ex nihilo, but who would rather have developed an effective recipe which opened technological possibilities and initiated the development of gunpowder warfare during the 15th century, is likened by Feldhaus to James Watt who did not so much "invent" the steam engine as improve the invention of Denis Papin to a point where its application became worthwhile.
While in Marburg in 1690, having observed the mechanical power of atmospheric pressure on his 'digester', Papin built a model of a piston steam engine, the first of its kind.
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