Work clothes were important for factories. Cowboys needed tough clothes too. Expanded railroads attracted workers. Levis Strauss was born in Germany in 1879. He went to America with his mom and two of his sisters when he was 18. His brothers owned a shop. The family entered the dry good business. He moved to San Fransisco during the gold rush. He moved to making tents. One day, a wife asked him to make a strong pair of pants for her husband. He invented blue jeans in 1873. They were more durable than other kinds of work pants.
The fire extinguisher was invented in 1818. The soda extinguisher invented in 1866 was a better system needed for large machines. Congreve invented a manual sprinkler system in 1812. Maxin invented an automatic sprinkler system in England, but it did not catch on. Henry Parmalee was born in Ohio in 1846. He faced high insurance for his piano factory. He invented the automatic fire sprinkler in 1874. It detected heat using sensitive elements. Parmalee had good success in the US.
Christofer Latham Shules, editor in Wisconsin. The typewriter prints letters onto paper when keys are pressed. He invented the QWERt'y keyboard in 1878. It increases typing speed to 100 words per minute. Competitors created alternate layouts. Remington Rand invented the UNIVAC alternate layout in 1936.
Cavities were treated in the ancient world. They used slow hand drills that were very painful. A clockwork drill was invented in 1864. George Green invented the electric dental drill in 1874. Made it easier to fix teeth. Used in filling cavities. It causes less pain.
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