As often happened in this age before modern communications , numerous physicists , scientists , and instrument makers are credited with having independently developed this same scale ; among them were Pehr Elvius , the secretary of the Royal Swedish Academy of Sciences ( which had an instrument workshop ) and with whom Linnaeus had been corresponding ; Christian of Lyons ; Daniel EkstrÃ m , the instrument maker ; and MÃ rten StrÃ mer ( 1707 â `` 1770 ) who had studied astronomy under Anders Celsius . As often happened in this age before modern communications , numerous physicists , scientists , and instrument makers are credited with having independently developed this same scale ; among them were Pehr Elvius , the secretary of the Royal Swedish Academy of Sciences ( which had an instrument workshop ) and with whom Linnaeus had been corresponding ; Christian of Lyons ; Daniel EkstrÃ m , the instrument maker ; and MÃ rten StrÃ mer ( 1707 â `` 1770 ) who had studied astronomy under Anders Celsius