Claim: John Speidell, along with William Oughtred and Richard Norwood, helped push toward the abbreviations of trigonometric functions and published a few work about mathematics, including An Arithmeticall Extraction in 1628.
Evidence: 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.