Henrik Gerner (1742–1787) was a Danish naval officer who specialised in shipbuilding and naval architecture. His interests as an entrepreneurial engineer led to unsinkable gun platforms, horse-driven dredging machines, and desalination equipment for Orient-bound trading ships. Early life and naval career The greatgrandson of the bishop of the same name, Henrik Gerner was born on 5 July 1742 in Copenhagen and baptised in Holmen Church and married in the same church on Christmas Eve 1773, Henrik Gerner became a volunteer cadet at the naval academy in 1755, sailing to the West Indies in the frigate Christianborg before becoming a full cadet the next year. Gerner graduated from the Naval Cadet Academy in Copenhagen as a junior lieutenant in 1763, where he was already interested in the art and science of shipbuilding, and in 1764 sailed with the frigate Falster to Russia and Sweden, receiving expenses for the studies of ships, ships' carpentry, and the ironworkings for anchors and cannon. In 1765 he was promoted to senior lieutenant and joined Prins Friderich in 1766. He was a close colleague of Ernst Wilhelm Stibolt and they obtained junior positions in the Construction Commission They were in England together studying ship building from 1768, and promotion for Gerner to Kaptain Lieutenant came in 1770. After a shorter spell in France, continuing his studies, Gerner was recalled to Denmark in 1772 and given the post of fabrikmester at Holmen and full membership of the Construction Commission. After further promotion he became a member, in 1776, of the Commission on Naval Defence and that same year was instrumental in founding the Ship Construction School. Ship building Some 117 ships of a variety of types and sizes are recorded as designed and built by Gerner, including 18 ships-of-the-line and 11 frigates. Ships of the line Prindsesse Sophia Frederica (1775) Indfødsretten (1776) Justitia (1777), lost to the British at the Battle of Copenhagen (1807) Oldenborg /1779) Ditmarsken (1780), lost to the British at the Battle of Copenhagen (1807) Arveprinds Friderich (1780) Prindsesse Lovisa Augusta /1782) Kronprinds Frederik (1784), lost to the British at the Battle of Copenhagen (1807) Mars (1784), lost to the British at the Battle of Copenhagen (1807) Nordstjernen (1785) Indfødsretten (1786) Fyen (1787) Sjælland (1787) Odin (1788) Neptunus (1789), lost to the British at the Battle of Copenhagen (1807) Tre Kroner (1789), lost to the British at the Battle of Copenhagen (1807) Skiold, lost