Steam Tugboat Hercules, first to be fitted with a two-stage steam machinery Gerhard Moritz Roentgen, 38 years old, a former naval officer and an engineer, who co-founded the Nederlandsche Stoomboot Maatschappij (NSM) in 1823, has invented a new compound steam engine and has decided to apply it to a sea-going vessel, a paddle wheel steam tug named Hercules, that he designed four years ago. ¤ Roentgen discovered steam machinery and iron industry through a long study voyage in