In 1838, after Henry's death, the Lambeth works supplied a 750 h.p. engine for Isambard Kingdom Brunel's famous SS "Great Western", the first purpose-built transatlantic steamship. They patented a double cylinder direct acting engine in 1839. They introduced some of the earliest screw propulsion units for ships, including one for the first Admiralty screw steamship, , in 1841. By 1850 the firm had supplied more than two hundred vessels with steam engines, though the firm's dominance was being challenged by John Penn's trunk engine design. They exhibited their engines at the 1862 International Exhibition.