""An Improved Method In The Art Of Signaling For Military And Scientific Purposes: One Instrument For Both Day And Night Work, Finley�������s Heliotrope"" is a book written by Thomas Somerville that details a new and improved method for signaling in both military and scientific contexts. The book focuses on the use of Finley's Heliotrope, a signaling instrument that can be used for both day and night...
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