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1625: Giovanni Faber of Bamberg (1574–1629) of the Linceans, after seeing Galileo's occhiolino, coins the word microscope by analogy with telescope. 1655: In an investigation by Willem Boreel, Dutch spectacle-maker Johannes Zachariassen claims his father, Zacharias Janssen, invented the compound microscope in 1590. Zachariassen's claimed ...
Spencer’s first microscopes were available for purchase in 1838. [2] Previous to Spencer’s invention, European manufacturers held a monopoly on research-quality microscopic equipment. [ 3 ] At least one of Spencer’s microscopes survives and is currently held by the Smithsonian Institution.
Country (also called country and western) is a music genre originating in the southern regions of the United States, both the American South and the Southwest.First produced in the 1920s, country music is primarily focused on singing stories about working-class and blue-collar American life.
Zacharias Janssen; also Zacharias Jansen or Sacharias Jansen; 1585 – pre-1632 [1]) was a Dutch spectacle-maker who lived most of his life in Middelburg.He is associated with the invention of the first optical telescope and/or the first truly compound microscope, but these claims (made 20 years after his death) may be fabrications put forward by his son.
The single-lens microscopes of Van Leeuwenhoek were relatively small devices, the largest being about 5 cm long. [41] [42] They are used by placing the lens very close in front of the eye. The other side of the microscope had a pin, where the sample was attached in order to stay close to the lens.
Ring-and-spring microphones, such as this Western Electric microphone, were common during the electrical age of sound recording c. 1925–45.. The second wave of sound recording history was ushered in by the introduction of Western Electric's integrated system of electrical microphones, electronic signal amplifiers and electromechanical recorders, which was adopted by major US record labels in ...
OPINION: Black contributions to country music have been completely whitewashed and erased, but Beyoncé’s latest musical endeavor is forcing America to remember what Black people built. The post ...
The country survived both World War I and the Great Depression before entering World War II in December 1941. Americans endured great loss and hardship but found hope and encouragement in music. The genres and styles present during this period were Native American music, blues and gospel, jazz, swing, Cajun and Creole music, and country. The ...