Abstract
There is a faintly pencilled note, dated 1798, in the William Smith archive at Oxford, which describes a colliers' method for measuring directions of dip and strike in the East Somerset coalfield. It explains some otherwise obscure passages in John Strachey's published records of local stratigraphy (Strachey, 1719; 1727), and it illuminates Smith's own interest in recording dip-directions of coals at collieries near High Littleton, where he had begun surveying work in 1791. His note is accompanied by drawings of two varieties of compass-dial, or circumferentor, naming these collieries.
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