Drawings of "drift cask" designed by <a href="https://en.wikipedia.org/wiki/George_W._Melville" class="extiw" title="w:George W. Melville">w:George W. Melville</a> (1841-1912) and, according to source, was part of presentation "Read at the VII International Geographical Congress at Berlin, 1899."
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Creation date of April 1898 is based on source's name of file: driftcaskApril189842a_200.jpg
<a href="https://en.wikipedia.org/wiki/George_W._Melville" class="extiw" title="w:George W. Melville">w:George W. Melville</a>
<p>Geographical Society of Philadelphia:<br>
URL: <a rel="nofollow" class="external free" href="http://www.geographicalsociety.org/archive/drift-cask-project/">http://www.geographicalsociety.org/archive/drift-cask-project/</a>
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Archive: <a rel="nofollow" class="external free" href="https://web.archive.org/web/20160804030608/http://www.geographicalsociety.org/archive/drift-cask-project/">https://web.archive.org/web/20160804030608/http://www.geographicalsociety.org/archive/drift-cask-project/</a>