variant devised by JohannOssanna [de] in 1899 is often named Ossanna diagram, Ossanna circle, Heyland-Ossanna diagram or Heyland-Ossanna circle. In 1910
(1917–1919) Jonathan Zenneck (1925–1927) Kaspar Dantscher (1927–1929) JohannOssanna (1929–1931) Richard Schachner (1931–1933) Anton Schwaiger (1933–1935)
(1917–1919) Jonathan Zenneck (1925–1927) Kaspar Dantscher (1927–1929) JohannOssanna (1929–1931) Richard Schachner (1931–1933) Anton Schwaiger (1933–1935)
(1917–1919) Jonathan Zenneck (1925–1927) Kaspar Dantscher (1927–1929) JohannOssanna (1929–1931) Richard Schachner (1931–1933) Anton Schwaiger (1933–1935)
(1917–1919) Jonathan Zenneck (1925–1927) Kaspar Dantscher (1927–1929) JohannOssanna (1929–1931) Richard Schachner (1931–1933) Anton Schwaiger (1933–1935)