Science and engineering in Manchester chemist visited Manchester in the 1840s. In his research in Manchester, Smith discovered the existence of acid rain, a by product of the industrial revolution. Smith consequently pushed for greater environmental awareness and helped to found the Noxious Vapours Abatement Society in Manchester, which raised awareness of the consequences of poor air. Joseph Whitworth was an engineer and inventor who hailed from Stockport, Cheshire (now Greater Manchester). A talented mechanic amongst various other engineering roles, for long periods of his life, he worked in factories in Manchester. Whitworth would ultimately devise a standard screw thread system, the first of its
Economic history of the United States an artificer or armorer who could perform this intricate gunsmithing. The requirement for interchangeable parts forced forward the development of modern metal-working machine tools, including milling machines, grinders, shapers and planers. The Federal Armories perfected the use of machine tools by developing fixtures to correctly position the parts being machined and jigs to guide the cutting tools over the proper path. Systems of blocks and gauges were also developed to check the accuracy and precision of the machined parts. Developing the manufacturing techniques for making interchangeable parts by the Federal Armories took over two decades; however, the first interchangeable small