ALS signed “G. Marconi,” five pages two sets of adjoining sheets, 5 x 8, 1889. Handwritten draft of a letter to Dr. J. Erskine Murray, concerning vertical reflector experiments he proposes to carry out at the Haven Hotel wireless station. In the draft, Marconi provides a rough sketch of his new design for "good tubes" which he hopes to have made and tested with signals from Alum Bay. In small part: "As you see the upper plug will have a small prominence which will dip into the filim[en]t. When using such a tube it will of course be necessary to have more thention [sic] on the tapper spring…as we wont 'have any help from gravity in springing the hammer back." In fine condition.
J. Erskine Murray, formerly Assistant Professor of Physics at Heriot-Watt College, Edinburgh, was Marconi's principal experimental assistant from November 1898 until his resignation in 1900. He worked at the station at Haven, Poole, until transferring to the Marconi factory at Chelmsford in July 1899.
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