He was 7th child of John Henslow, a master carpenter in the dockyard at Woolwich. • 1745 Apprenticed to
Sir Thomas Slade • 1762 Master Boat Builder at Woolwich • 1771 Assistant Surveyor to the Navy • 1784
Surveyor to the Navy • 1793 Knighted • 1806 retired to
Sittingbourne, Kent Cape Henslow on
Guadalcanal is named after him. From 1793 he worked jointly with
William Rule. Among the vessels he designed were the s and four frigates to the same design, the first of which was . He also designed the
Bloodhound-class gun-brigs and
Conquest-class gun-brigs. The
sixth rates were a series of six ships built to his 1805 design. Perhaps his smallest vessels were the two
Placentia-class sloops of 42 tons burthen, which he designed for coastal patrol duties off
Newfoundland. ==Family==