Reference numberNLB/56/441
Alternative reference numberNLB/56 p259
TitleCopy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Thomas Bon Dapray Esquire; The Christiana Apt. 21, 1829 California Street, Washington
Date13 February 1919
DescriptionInforms Mr. Thomas Bon Dapray that he is not aware of an invention called 'The Searchlight', however, that the description given corresponds with 'Thermophones', an invention laid out in a paper by M. De Lange. Notes that an abstract of this paper was published in the 'Proceedings' and can be found in volume 92 (A).
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    Browse the records of some of our collections, which cover all branches of science and date from the 12th century onwards. These include the published works of Fellows of the Royal Society, personal papers of eminent scientists, letters and manuscripts sent to the Society or presented at meetings, and administrative records documenting the Society's activities since our foundation in 1660.

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