This Day in Geek History: February 15
399 BCE
The philosopher Socrates, who will widely be credited with the laying the foundations of Western philosophy, is sentenced to death.
1897
Ferdinand Braun publishes a paper in the journal Annalen der Physik und Chemie describing his “Braun tube”, which is the first cathode-ray oscilloscope. He developed the oscilloscope as a method to record and study the time dependence of alternating currents. Cathode-ray tubes had previously been characterized by uncontrolled rays. Braun produced a narrow stream of electrons, guided by means of alternating voltage, that could be traced on a fluorescent screen. A coil wrapped around the Braun tube produces a vertical deflection of the electron beam. Horizontal deflection of the image to create a “time” axis is achieved by a small rapidly rotating mirror placed in front of the CRT. The development of this first CRT is the culmination of many centuries of research and many integral discoveries, including: the first manmade phosphor (1603), the first gas discharge tube (1751), the first production of light by exciting a phosphor with an electrical discharge (1768), and the first magnetic (1859) and electrostatic (1876) deflection of cathode-rays. Along the way, discoveries by such famous names as Bernoulli, Faraday and Hertz contributed to the sum of knowledge which allowed Karl Ferdinand Braun to combine them in what became known as the Braun tube (1897).
1903
The first teddy bear is introduced in America. It is made by two Russian immigrants, Morris and Rose Michtom, who own a toy and novelty store in Brooklyn, New York. In the US, it is widely believed that they derived the name “teddy bear” from President Theodore Roosevelt’s nickname, “Teddy.” While bear hunting in Mississippi in 1902, Roosevelt decided to spare the life of a bear cub which had been orphaned during the hunt. The event was the subject of a cartoon in the Washington Post seen by the Michtoms. Inspired by the cartoon, Mrs. Michtom made a toy bear which became enormously popular with the public.
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Italian astronomer Galileo Galilei arrives in Rome for his trial before the Inquisition, during which he will be charged with professing the belief that the Earth revolves around the Sun. Enemies of Galileo had convinced Pope Urban VIII that the character Simplicio in the Dialogue ineptly defending the Ptolemaic system, was a thinly veiled caricature of himself. A document would be produced alleging that Bellarmine forbade Galileo from discussing Copernican ideas in any way. (Modern scholars determined this document to be a forgery). Galileo faces two charges: disobeying Bellarmine’s order and misleading censors who had published his book. Humiliated and threatened with torture, Galileo will have no choice but to admit guilt, and “abjure, curse and detest the aforesaid errors and heresies…”