Lantern Slide - Cross-Section of Watt's Rotative Double-Acting Condensing Steam Engine; Birmingham; England; circa 1782; One of 239 glass lantern slides depicting products manufactured by Tangyes Limited engineers of Birmingham; England. The images include various products such as engines; centrifugal pumps; hydraulic pumps; gas producers; materials testing machines; presses; machine tools; hydraulic jacks etc. Tangyes was a company which operated from 1857 to 1957. They produced a wide variety of engineering