Claim: John Speidell, along with William Oughtred and Richard Norwood, helped push toward the abbreviations of trigonometric functions and published a number of work about mathematics, including An Arithmeticall Extraction in 1628.
Evidence: Speidell was a mathematics teacher in London and one of the early followers of the work John Napier had previously done on natural logarithms. Along with William Oughtred and Richard Norwood, Speidell helped push toward the abbreviations of trigonometric functions. Speidel published a number of work about mathematics, including An Arithmeticall Extraction in 1628.