George de Hevesy, (1885– 1966 ) Hungary – radioactive tracer
Rowland Hill, (1795–1879)
Maurice Hilleman, (1919–2005) – vaccines against childhood diseases
Ted Hoff, (1937–)
Felix Hoffmann (Bayer), (1868–1949)
Herman Hollerith, (1860–1929) U.S. – recording data on a machine readable medium,
tabulator, punched cards
Nick Holonyak, ( 1928 – ) U.S. – LED (Light Emitting Diode)
Robert Hooke, (1635–1703) England – balance wheel, iris diaphragm
Erna Schneider Hoover, (1926–) U.S. – computerized telephone switching system
Frank Hornby, (1863–1936)
Coenraad Johannes van Houten, (1801– 1887 ) Netherlands – cocoa powder, cacao
butter, chocolate milk
Elias Howe, (1819–1867)
Muhammad Husayn, (fl.17th century) Persia/Iran – cartographic Qibla indicator with
sundial and compass
Christiaan Huygens, (1629–1695)
John Wesley Hyatt, (1837–1920)
I
Sumio Iijima, (1939- )
Gavriil Ilizarov, (1921–1992) Russia – Ilizarov apparatus, external fixation, distraction
osteogenesis
Sergey Ilyushin, (1894–1977) Russia – Il-series aircraft, including Ilyushin Il-2 bomber (the
most produced military aircraft in history)
János Irinyi, (1817–1895)
Aleksei Isaev, (1908–1971) Russia – first rocket-powered fighter aircraft, BI-1 (together
with Isaev)
Ub Iwerks, (1901–1971) U. S. – Multiplane camera for animation
J
Jabir ibn Aflah (Geber), (c. 1100–1150)
Jābir ibn Hayyān (Geber), (c. 721-815)
purification, retort, mineral acids, nitric and sulfuric acids, hydrochloric acid, aqua regia,
alum, alkali, borax, pure sal ammoniac, lead carbonatic, arsenic, antimony, bismuth, pure
mercury and sulfur, plated mail
Moritz von Jacobi, (1801–1874) Germany/Russia – electrotyping, electric boat
Karl Guthe Jansky, (1905–1950)
Karl Jatho, (1873–1933)
Al-Jazari, (1136–1206) Iraq – crank-driven and hydropowered saqiya chain pump, crank-
driven screw and screwpump, elephant clock, weight-driven clock, weight-driven pump,
