Historical (46)
Ideas and Innovation in the 20th Century History
093132-0001 Ideas and Innovation in the 20th Century History
British Troops Shooting and Charging, Canada, 18th Century Reenactment, 1970s
070083-0003 British Troops Shooting and Charging, Canada, 18th Century Reenactment, 1970s
George Washington Inauguration, USA, 1789 Recreation
070079-0001 George Washington Inauguration, USA, 1789 Recreation
Thomas Jefferson, Louisiana Purchase, USA, 1800s Recreation
070079-0002 Thomas Jefferson, Louisiana Purchase, USA, 1800s Recreation
Abraham Lincoln, Presidential Power, USA, 1800s, Recreation
070079-0003 Abraham Lincoln, Presidential Power, USA, 1800s, Recreation
Hans Ørsted Discovers Electromagnetism, Denmark, 1800s
070312-0006 Hans Ørsted Discovers Electromagnetism, 1820
Hans Christian Ørsted was a Danish physicist and chemist who discovered that electric currents create magnetic fields, which was the first connection found between electricity and magnetism. Oersted's law and the oersted unit are named after him
Cooke and Wheatstone Invent the Telegraph, UK, 1800s
070012-0008 Cooke and Wheatstone Invent the Telegraph, 1800s The Cooke and Wheatstone telegraph was an early electrical telegraph system dating from the 1830s invented by English inventor William Fothergill Cooke and English scientist Charles Wheatstone. It was a form of needle telegraph, and the first telegraph system to be put into commercial service. The receiver consisted of a number of needles which could be moved by electromagnetic coils to point to letters on a board. This feature was liked by early users who were unwilling to learn codes, and employers who did not want to invest in staff training.
Samuel Morse and Alfred Vail Invent the Morse Code, USA, 1800s
070312-0009 Samuel Morse and Alfred Vail Invent the Morse Code, USA, 1800s. Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. Morse code is named after Samuel Morse, one of the inventors of the telegraph.
Lord Kelvin, Mirror Galvanometer, UK, 1800s
070312-0010 Lord Kelvin's Mirror Galvanometer, UK, 1800s
he mirror galvanometer was improved significantly by William Thomson, later to become Lord Kelvin. He coined the term mirror galvanometer and patented the device in 1858. Thomson intended the instrument to read weak signal currents on very long submarine telegraph cables. This instrument was far more sensitive than any which preceded it, enabling the detection of the slightest defect in the core of a cable during its manufacture and submersion.
