Jerry Penry has just published an interesting article for American Surveyor magazine, discussing how ocean currents are mapped and tracked - one of these means being drift bottles.
NGS is one organization which has been using drift bottles since 1846. Some of the amazing travels of drift bottles are described in the article, and among the interesting exhibits in the article are a collection of bathtub toys accidentally lost from a ship from a cargo of tens of thousands, and set adrift, and another excellent exhibit in the article is a 1786 map by James Poupard, illustrating the Gulf Stream.
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