July 3, 1769.—Arkwright' ramous patent for spinning by rollers was taken out on July 3, 1769, a few months after Watt's still more famous patent on the separate condenser for steam engines. A barber by trade. Arkwright became interested in the cotton - spinning problem in 1766 when thirty-five years of age, and his first TOachine was exhibited in the old Grammar School at Preston two years later His machine of 1769 is preserved in the Science Museum, South Kensington. There are four rollers in pairs, the top rollers being covered with leather, while the lower rollers are fluted, the several pairs being weighted to ensure contact. His roller drawing principle exists to-day.