In 1847 his younger brother, John Inglis (1819–1888), joined him, who had learned the craft of marine engineering and whose practicable skills added another dimension to the company.
From then onwards the company grew in strength and rapidly earned a reputation for ability and at least equality to much larger and longer established firms.
In 1855, the Inglis brothers provided the machinery of the large screw steamer Tasmanian, one of the largest and fastest vessels built up until that date.
The site was limited in size but it became an extremely important and credible shipyard run by the Inglis family to exceptionally high standards.
From this Yard there came many classic designs and creations of maritime beauty and success, along with the normal workmanlike dredgers, tugs, coasters, barges, tankers and whalers.