1891 also marked the beginning of another round of upgrades, adding Durham-style regenerative-heating stoves to No. 6 and No. 7 stacks. In 1893, No. 1 and No. 2 stacks were abandoned: No. 1 was demolished and rebuilt with the new stoves, which were also added to No. 10 and No. 11 furnaces (former Saucon Iron). 1893 also marked the accession of Benjamin Franklin Fackenthal Jr., as president of the company: he would oversee the last halcyon period in the history of Thomas Iron.