I don't know if Underwood Dudley ever put it online, but at one point he did publish his collection under the title "The Trisectors" (978-0883855140). For every

I don't know if Underwood Dudley ever put it online, but at one point he did publish his collection under the title "The Trisectors" (978-0883855140). For every single failed trisection he provides a diagram, a brief description of the construction, and a measure of the error.