Welcome to the All New Todd County School District Website! The Todd County School District is comprised of eleven schools scattered all across Todd County in south-central South Dakota. Currently, we have over 1800 students enrolled in grades K-12, and our family of staff is growing every day!
In addition, Edison did not simply come up with the idea on October 21, 1879. He had been working on his light bulb since 1877. He had been trying to come up with a material that could be used as a filament for the light bulb without burning out too quickly. He tried many different substances.homas Edison invented the light bulb in 1879. Edison discovered that a carbon filament in an oxygen-free bulb glowed but did not burn up for 40 hours. Edison eventually produced a bulb that could glow longer. Yojana_Thapa | Student, Grade 10 | TA | (Level 1) Valedictorian.
Edison's  lamp became the first commercially successful incandescent lamp  (circa 1879). Edison received U.S. Patent 223,898 for his  incandescent lamp in 1880.    However, contrary to popular belief, Edison did not invent the  first lightbulb, he improved upon a 50-year-old idea. Canadians  Henry Woodward and Matthew Evans patented a light bulb in 1875, but  could not raise the financing to commercialize their invention.  Edison bought the rights to their patent.