Lee De Forest was a prolific inventor who invented the vacuum tube in 1906 making TV and computers possible. All electronics used his vacuum tubes until the invention of the transistor in 1948. He coined the word "radio" and built the first radio station. He invented the method used to put sound on film making the "talkies" possible in 1922. He was an ambitious schemer constantly looking for ways to make a buck, cheated many investors but he was largely responsible for the world we have…
The first practical sound recording and reproduction device was the mechanical phonograph cylinder, invented by Thomas Edison in 1877 and patented in 1878. The invention soon spread across the globe and over the next two decades the commercial recording, distribution and sale of sound recordings became a growing new international industry, with the most popular titles selling millions of units by the early 1900s.
Thomas Alva Edison had a thirst for learning, but left school early because he was hearing impaired and couldn’t hear what his teachers were saying. He was homeschooled by his mom. In this mini biography of him, you will learn about his accomplishments, and his persistent nature. You will see the major steps he took which contributed to his success. We learn from Edison the importance of taking action.
Ludwig Eduard Boltzmann (d. 20 Şubat 1844, Viyana – ö. 5 Eylül 1906, Duino-İtalya). Avusturyalı fizikçi. İstatistiksel mekanik ve istatistiksel termodinamik alanındaki buluşları ve katkıları ile ünlüdür. Henüz tartışmalı olduğu günlerde dahi atom teorisinin en önemli savunucuları arasında yer almıştır.