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The last Summer I was present with Dr. George Volcamer, (a person very skilful in physick and chymistry, and much versed in mathematical knowledge and experiments) while he was making some observations and tryals, with his magnetical needle, to find whether it had varied from what it was heretofore, and what was the present true variation.

philosophical collections of the royal society of london

An extract of a letter from the learned Johan. Christop. Sturmius, Professor of Mathematicks and Philosophy at Altdorf in Germany. Giving an account of the variation of the needle, lately made, of an experiment in the exhausting engine. And of the phosphores of Dr. Krunkel.