ANS signed "Marconi," one page, 5.25 x 3, no date but circa March 1902. A note penned by Marconi while aboard the ship Philadelphia on the Atlantic Ocean, while conducting tests pertaining to long-distance wireless transmission. In full: "Expanse. London. Inform Ochs immediately. Messages one thousand five hundred and fifty one. Test letter two thousand and ninety nine. On tape receiver." Affixed to a larger slip and in fine condition.
In March 1902, Marconi left England on a trans-Atlantic voyage aboard the steamer Philadelphia, which was fitted with his telegraph apparatus. On this trip he discovered that messages could be received from greater distances at night; in this case, he records receipt of wireless messages from England from a distance of up to 1,551 miles, and wireless signals on Morse instruments from up to 2,099 miles from Poldhu Station, England. This note is particularly significant, as it was reproduced in the column 'Progress of Wireless Telegraphy' in 'The Weekly Marconigram' of May 28, 1903, an original copy of which is included (split at spine, with several small edge nicks and tears). The success of Marconi's experiments soon landed him government contracts with several nations, and he began building out high-powered coastal telegraph stations on both sides of the Atlantic—the beginning of the wireless communication revolution.
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