History of the transistor about 15 volts". Brattain and H. R. Moore made a demonstration to several of their colleagues and managers at Bell Labs on the afternoon of 23 December 1947, often given as the birth date of the transistor. The "PNP point-contact germanium transistor" operated as a speech amplifier with a power gain of 18 in that trial. In 1956 John Bardeen, Walter Houser Brattain, and William Bradford Shockley were honored with the Nobel Prize in Physics "for their researches on semiconductors and their discovery of the transistor effect". Twelve people are mentioned as directly involved in the invention of the transistor
Nobel Prize controversies Nobel Prize controversies After his death in 1896, the will of Swedish industrialist Alfred Nobel established the Nobel Prizes. Nobel's will specified that annual prizes are to be awarded for service to humanity in the fields of physics, chemistry, physiology or medicine, literature, and peace. Similarly, the Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel is awarded along with the Nobel Prizes. Since the first award in 1901, the prizes have occasionally engendered criticism and controversy. Nobel sought to reward "those who, during the preceding year, shall have conferred the greatest benefit on mankind". One prize, he