answers: 1871
context: Siderography Siderography is a mechanical process developed by Jacob Perkins in the early 1800s enabling the unlimited reproduction of engraved steel plates. The process enables the transfer of an impression from a steel plate to a steel cylinder in a rolling press. An individual who engraves steel plates was known as a siderographist in the mid 1800s, and a siderographer by the early 1900s. Perkins developed the use of steel plates in banknote production in 1805, and these were more resistant to wear from printing than copper plates. Siderography enabled the steel plates to be copied with greater frequency. It </s> his children, Isabella and Richard Willes, an artist, who each died in 1929 and 1953 respectively. Richard Leach Maddox Richard Leach Maddox (4 August 1816 – 11 May 1902) was an English photographer and physician who invented lightweight gelatin negative plates for photography in 1871. Richard Leach Maddox was born at Bath, England, on 4 August 1816. Long before his discovery of the dry gelatin photographic emulsion, Maddox was prominent in what was called photomicrography - photographing minute organisms under the microscope. The eminent photomicrographer of the day, Lionel S. Beale, included as a frontispiece images made by Maddox in </s> Plated ware Plated ware refers to articles chiefly intended for tableware consisting of a base metal or alloy covered by one of the precious metals, with the object of giving them the appearance of gold or silver. Historically, the standard amount of precious metal used was an ounce of silver per square foot of surface area (2.8cL per 930 cm²). Although items hand-plated with metal leaf date back to ancient times, large scale production dates to 1742 when Thomas Boulsover, of Sheffield, England developed a process by which silver plates were fused to base metal (generally copper) ingots by heating
question: where did the dry plate ( gelatin-silver ) system originate