 In 1863, Étienne-Jules Marey (1830–1904) improved the device by making it portable.Also he included a specialized instrument to be placed above the radial artery that was able to magnify pulse waves and record them on paper with an attached pen.In 1880, Samuel von Basch (1837–1905) invented the sphygmomanometer, which was then improved by Scipione Riva-Rocci (1863–1937) in the 1890s.