Radar;Radar is an acronym for Radio Detecting and Ranging. It refers to a method of locating something or measuring motion by sending out a beam of electromagnetic radiation and receiving the signals rebounded from distant objects.
Radio telescope;Instrument used to detect radio waves emanating from celestial bodies.
Raffard;Raffard, Jules: 1824 to 1898, physicist
Raman;Raman, Sir Chandrasekhara Venkata: 1888 to 1970, Indian physicist
Ramelli;Ramelli, Agostino, c. 1530 to 1590, engineer
Ramjets;Ramjets are high-pressure reaction engines, in which inrushing is compressed in an expanding duct (supersonic diffuser) and is then forced through the combustion chamber.
Ramsay;Ramsay, William Sir: 1852 to 1916, chemist
Ramsden;Ramsden, Jesse, 1735 to 1800, precision engineer and optician
Rankine;Rankine, Wlliam John Marquorn: 1820 to 1872, engineer
Ranney;Ranney, Leo: 1884 to 1950, engineer
Rateau;Rateau, Auguste: 1863 to 1930, engineer
Raydt;Raydt, Wilhelm: 1842 to 1908, engineer
Rayleigh;Rayleigh, Lord (to 1873 John William Strutt): 1842 to 1919, physicist
Reaction effect;The force, exerted on an object, when it expels or repels a mass with a given force.
RΘaumur;RΘaumur, RenΘ-Antoine Ferchault de: 1683 to 1757, physicist and zoologist
Reber;Reber, Grote (* 1911), American astronomer
Rectifier;A rectifier is an electronic device or a circuit used to convert, i.e. to rectify, alternating current into direct current.
Redtenbacher;Redtenbacher, Ferdinand: 1809 to 1863, engineer
Reflecting telescope;Special type of telescope, in which incident light is first reflected by a concave main or primary mirror and is then deflected.
Reflector;Designation for a reflecting telescope, in which light is focused by a concave mirror.
Refractor;Designation for a refracting telescope, in which light is focused by lenses.
Regiomontanus;Regiomontanus (real name Johannes Mⁿller): 1436 to 1476, mathematician and astronomer
Regnasult;Regnasult, Henri Victor: 1810 to 1878, chemist and physicist
Reichenbach;Reichenbach, Georg Friedrich von: 1771 to 1826, instrument and machine manufacturer
Reis;Reis, Johann Philipp (1834-1874), German inventor
Reithmann;Reithmann, Christian: 1818 to 1909, clockmaker
Remmington;Remmington, Philo: 1816 to 1889, engineer
Renard;Renard, Charles: 1847 to 1905, engineer
Renault;Renault, Louis: 1877 to 1944, engineer and industrialist
Ressel;Ressel, Josef Ludwig Franz: 1793 to 1857,engineer
Reuleaux;Reuleaux, Franz: 1829 to 1905, engineer
Rey;Rey, Jean: 1861 to 1935, engineer
Reynold;Reynold, Osborne: 1842 to 1912, physicist
Richardson;Richardson, Owen Williams: 1879 to 1959, physicist
Richter;Richter, Johann Benjamin: 1762 to 1807, chemist
Riggenbach;Riggenbach, Nikolaus: 1817 to 1899, engineer
Righi;Righi, Augusto: 1850 to 1920, physicist
Rines;Rines, Robert H.: (* 1922), inventor and lawyer
Ritter;Ritter, Johann Wilhelm: 1776 to 1810, physicist
Rittinge;Rittinge, Peter von: 1811 to 1872, engineer
Roberts;Roberts, Richard: 1789 to 1856, engineer
Rochon;Rochon, Alexis Marie du: 1741 to 1817, astronomer and theologist
Rockets;Space vehicles propelled by a rocket that creates upward thrust by expelling burnt fuel.
Roentgen;Roentgen, Gerhard Moritz: 1795 to 1852, engineer
Rois;Rois, Mirko: 1879 to 1961, civil engineer
R°mer;R°mer, Ole Christensen: 1644 to 1710, astronomer
R÷ntgen;R÷ntgen, Wilhelm Conrad (1845-1923), German physicist, first Nobel prize winner for physics (1901)
Rosing;Rosing, Boris Lvovich: 1869 to 1933, physicist
Rosinski;Rosinski, Edward J.: (* 1921), engineer
Rotational speed;Rotational speed is a determinant of the mechanical performance of a machine. It describes how many revolutions a rotating object completes in a given period.
Rowland;Rowland, Henry Augustus: 1848 to 1901, physicist
Royce;Royce, Sir Frederic Henry: 1863 to 1933, engineer
Rubin;Rubin, Benjamin A.: (* 1917), microbiologist
Ruhmkorff;Ruhmkorff, Heinrich Daniel: 1803 to 1877, engineer
Rukop;Rukop, Hans: 1883 to 1958, physicist
Rumford;Rumford, Count (Sir Benjamin Thompson): 1753 to 1814, physicist
Runge;Runge, Friedlieb Ferdinand: 1795 to 1867, chemist
Runge;Runge, Wilhelm: 1895 to 1987, physicist
Ruska;Ruska, Ernst August Friedrich (1906-1988), German physicist, Nobel prize for physics 1986
Russel;Russel, John Scott: 1808 to 1882, engineer
Rutherford;Rutherford, Ernest (Baron Rutherford of Nelson): 1871 to 1937, physicist
Rydberg;Rydberg, Johannes Robert: 1854 to 1919, physicist
Sack;Sack, Rudolf: 1824 to 1900, farming machine engineer
Saint-Vernant;Saint-Vernant, AdhΘmar Jean Claude BarrΘ de: 1797 to 1886, mathematician
Santos-Dumont;Santos-Dumont, Alberto: 1873 to 1932, aviation pioneer
Sarett;Sarett, Lewis Hastings: 1917 to 1999, chemist
Satellite;In astronautics an artificial satellite is a spacecraft that orbits a planet (usually the Earth) unpowered, while in astronomy it is any moon.
Saturn V rocket;Large booster rocket that launched the Apollo missions into the Earth's orbit before sending it on its way to the Moon.
Sauveur;Sauveur, Joseph: 1653 to 1716, mathematician and physicist
Savart;Savart, FΘlix: 1791 to 1841, physician and physicist
Savery;Savery, Thomas: c. 1650 to 1715, engineer
Scheele;Scheele, Carl Wilhelm: 1742 to 1786, chemist
Scheiner;Scheiner, Christoph: 1575 to 1650, scholar
Scherrer;Scherrer, Paul: 1890 to 1969, physicist
Schichau;Schichau, Ferdinand: 1814 to 1896, engineer
Schickard;Schickard, Wilhelm: 1592 to 1635, scholar
Schilling;Schilling, Paul von Cannstadt: 1786 to 1837, physicist
Schmidt G.;Schmidt, Gustav: 1826 to 1883, mining engineer
Schmidt W.;Schmidt, Wilhelm: 1858 to 1924, engineer
Sch÷bein;Sch÷bein, Christian Friedrich: 1799 to 1868, chemist
Sch÷ffer;Sch÷ffer, Peter: c. 1425 to c. 1502, printer
Schorlemmer;Schorlemmer, Carl: 1834 to 1892, chemist
Schott;Schott, Freidrich Otto: 1851 to 1935, chemist and glass engineer
Schottky;Schottky, Walter: 1886 to 1976, physicist
Schr÷dinger;Schr÷dinger, Erwin: 1887 to 1961, physicist
Schr÷ter;Schr÷ter, Fritz: 1886 to 1973, physicist
Schubert;Schubert, Johannes Andreas: 1808 to 1870, engineer
Schuckert;Schuckert, Johann Siegmund: 1846 to 1895, electrical engineer
Schⁿtte;Schⁿtte, Johann: 1873 to 1940, engineer
Schweigger;Schweigger, Johannes Salomon Christoph: 1779 to 1856, physicist
SchwilguΘ;SchwilguΘ, Jean Baptiste: 1776 to 1856,engineer and precision engineer
Sculls;A scull is a sports rowing boat, in which each rower moves two oar blades. These boats may be classed as single or double sculls. It may be contrasted with a single-oared boat, in which each rower moves an oar blade with both hands.
Seaborg;Seaborg, Glenn Theodore: 1912 to 1999, physical chemist
Seasons;Seasons: division of the tropical year into four set periods.
Seebeck;Seebeck, Thomas Johann: 1770 to 1831, physicist and physician
Seger;Seger, Hermann August: 1839 to 1893, chemist
Segner;Segner, Johann Andreas Von: 1704 to 1777, physician and physicist
Sensors;Sensors are devices that react to external conditions such as temperature, light sensitivity, pressure, humidity or acidity in a fluid and convert them into electric signals.
Serpollet;Serpollet, LΘon: 1859 to 1907, engineer
Sertⁿrner;Sertⁿrner, Friedrich Adolf: 1783 to 1841, chemist
Server;A server is a computer in a network that performs certain administrative functions, e.g. managing a database or hard drive, administering of the network itself or relaying communications with other networks.
Shannon;Shannon, Claude Elwood: (* 1916): mathematician
Sheehan;Sheehan, John C.: 1915 to 1992, chemist
Shellac;Shellac is a natural, yellowish resin, formerly used to manufacture gramophone records. It is a substance secreted by the female lac insect and is used today for sealing wax or furniture lacquer.
Shockley;Shockley, William (1910 to 1989), British-American Physicist, Nobel prize winner for physics 1956 (along with John Bardeen and Walter Houser Brattain)
Shukovski;Shukovski, Nikolai Yegorovich: 1847 to 1921, scientist
Siedersleben;Siedersleben, Wilhelm: 1835 to 1892, farming machine engineer
Siemens E.W.;Siemens, Ernst Werner von (1816-1862), German physicist and engineer
Siemens F.;Siemens, Friedrich: 1826 to 1904, engineer and brother of Werner S.
Siemens W.;Siemens William Sir: 1822 to 1883, engineer and brother of Werner S.
Sigl;Sigl, Georg: 1811 to 1887, machine manufacturer
Sikorsky;Sikorsky, Igor Ivanovich: 1889 to 1965, aeronautical engineer
Simpson;Simpson, James Young: 1811 to 1870, physician
Singer;Singer, Isaac Merrit: 1811 to 1873, engineer
Single-oared boat;In a single-oared boat each rower holds and moves an oar blade with both hands. They may be contrasted with sculls, in which the rower moves two oar blades.
Sinin;Sinin, Nikolai Nikolayevich: 1812 to 1880, chemist
Sinsteden;Sinsteden, Wilhelm Josef: 1803 to 1891, physician
Skladanowsky;Skladanowsky, Max: 1863 to 1939, film pioneer
Skoda;Skoda, Emil von: 1839 to 1900, engineer
Slaby;Slaby Adolf: 1849 to 1913, engineer
Slavyanov;Slavyanov, Nikolai Gavrilovich: 1854 to 1897, electrical engineer
Smeaton;Smeaton, John: 1724 to 1792, engineer
Smith F.P.;Smith, Sir Francis Petty: 1808 to 1874, engineer
Smith J.;Smith, James: 1779 to 1850, engineer
Snell;Snell, Wilbrord: 1591 to 1626, physicist
Soddy;Soddy, Fredric: 1877 to 1956, physicist and chemist
Solvay;Solvay, Ernest: 1838 to 1922, chemist and entrepreneur
Somerset;Somerset, Edward (2nd Marquess of Worcester):1601to 1667, inventor
Sommerfeld;Sommerfeld, Arnold: 1868 to 1951, physicist
S÷mmering;S÷mmering, Samuel Thomas: 1775 to 1830, physician and natural scientist
Space probe;A spacecraft propelled by a multistage rocket at an escape velocity, required to escape the Earth's gravitational pull.
Space vehicle;Motion of an artificial object in space.
Spectroscope;An appliance used to measure the wavelength of electromagnetic radiation.
Spectrum;Splitting of light into its constituent components (wavelengths).
Speed of light;Speed at which light travels in a vacuum. Its value is 300,000 km/s.
Sperry;Sperry, Elmer Ambrose: 1860 to 1930, engineer
Spoke;A spoke is one of many relatively thin radial rods that join the hub of a wheel with the rim. Early wheels were simply solid discs.
Sputnik;"Sputnik" was the Earth's first artificial satellite. It was launched on October 4th, 1957 by the former Soviet Union and was the first artificial satellite ever that accompanied the Earth in its orbit around the Sun.
Stahl;Stahl, Georg Ernst: 1755 to 1830, chemist and physician
Stanhope;Stanhope, Charles: 1735 to 1816, engineer
Stanley Jr;Stanley Jr., William: 1858 to 1916, engineer
Staudinger;Staudinger, Hermann: 1881 to 1965, chemist
Stefan;Stefan, Josef: 1835 to 1893, physicist
Steinheil;Steinheil, Carl August von: 1801 to 1870, physicist
Steinmetz;Steinmetz, Carl: 1865 to 1923, electrical engineer
Stelzer;Stelzer, Alfred: 1840 to 1895, geologist and mineralogist
Stephenson G.;Stephenson, George (1781-1848), British engineer
Stephenson J.;Stephenson, John (1809-1893), Irish-American engineer
Stephenson R.;Stephenson, Robert: 1803 to 1859, engineer and son of George S.
Stern;Stern, Otto: 1888 to 1969, physicist
Stevens J.;Stevens, John: 1749 to 1838, engineer and industrialist
Stevens R.;Stevens, Robert Livingstone: 1787 to 1856, engineer
Stevin;Stevin, Simon: 1548 to 1620, mathematician, master builder and physicist
Stibitz;Stibitz, George R.: 1904 to 1995, mathematician and physicist
Stokes;Stokes, George Gabriel: 1818 to 1903, mathematician and physicist
Stoletov;Stoletov, Aleksander Grigoryevich: 1839 to 1896, physicist
Stra▀mann;Stra▀mann, Friedrich (Fritz) Wilhelm (1902-1980), German chemist
Sulzer-Hirzel;Sulzer-Hirzel, Jean-Jacques: 1806 to 1883, machine manufacturer
Sumerians;The Sumerians were the earliest inhabitants of Mesopotamia recorded in history and were mentioned from around 3100 BC. They are of uncertain origin.
Sundback;Sundback, Gideon, Swedish electrical engineer
Swan;Swan, Sir Joseph Wilson: 1829 to 1914, engineer
Swash Plate;A swash plate is a disc aligned at an oblique angle to its axis of rotation. It is used in helicopters and can adjust the pitch of the rotor blades with the aid of a control rod.
Symington;Symington, Wlliam,: c. 1763 to 1831, engineer
Synchronized cameras;A synchronized camera is employed in cinematography, when lip movements need to be exactly synchronized with the sound track. It can record sound directly along with moving pictures rather than on separate magnetic tapes.
Synge;Synge, Richard Lawrence Millington: (* 1914)
