Harrow Plow Disc

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This is an actual harrow disc from the plow 14-year-old Philo Farnsworth used in 1921 to create the lines in the dirt that inspired his concept for electronic television. His “big idea” was that if he could train electrons to scan a picture from side-to-side, the way his horses moved across the field, he could send images to distant locations where they could be reconstructed line-by-line. He had not yet been to high school.