This Month in History:

1884 Chrome tanning process for leather patented by Augustus Schultz

1816 Sophie Germain is the first woman to win a prize from the Paris Academy of Sciences for her paper on elasticity

1907 3-element vacuum tube patented by Dr Lee De Forest

1799 1st US patent for a seeding machine, Eliakim Spooner, Vermont

1926 Physicist Erwin Schrödinger publishes his theory of wave mechanics and presents what becomes known as the Schrödinger equation in quantum mechanics

1838 Samuel Morse and Alfred Vail demonstrate their telegraph machine in New Jersey