Labels:text | book OCR: A B HOFFMANN-LA ROCHE EDWIN HOLMES fl. 1858 E F TIQUID CRYSTALS were first G discovered in 1888 by Freidrich H Reinitzen, an Austrian botanist. In 1968, scientists discovered that I 1 the crystals changed color when K an electric current passed through L them. Researchers all over the world M tried to think of ways they could use A N EARLY BURGLAR ALARM N this new property. from the 1800s consisted of a By 1970, the Swiss chemical trip wire that set off a camera and a P ʻQ company Hoffmann-La Roche had magnesium flash. The much more R produced the first working liquid S crystal displays. These were soon practical electric burglar alarm was patented in 1858 by a Mr. Edwin T used in watches and calculators. Holmes of Boston. W 123 Y Liquid Crystal Display Burglar Alarm 7 M 1
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