Tonkin put forth in 1737 proposals for printing a history of Cornwall, in three volumes of imperial quarto at three guineas; and on 19 July 1736 he prefixed to a collection of modern Cornish pieces and a Cornish vocabulary, which he had drawn up for printing, a dedication to William Gwavas of Gwavas, his chief assistant (this dedication was sent by Prince L. L. Bonaparte on 30 November 1861 to the 'Cambrian Journal,' and there reprinted to show the indebtedness to Tonkin's labours of William Pryce.
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He was a leading member of a group of antiquaries in west Penwith; this group also included John Boson and Thomas Boson, William Gwavas, Thomas Tonkin, William Borlase, Oliver Pender, and James Jenkins of Alverton.
Much of the material was taken directly from the collections of Thomas Tonkin and William Gwavas, as acknowledged in the preface.