<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Actually, the first appearance of the margarita glass is an Annex to TC97/SC16/N227, October 1978. The second meeting of OSI, the first meeting of the Working Groups. It was drawn by John Aschenbrenner of IBM and one of the originators of SNA.<div class=""><br class=""></div><div class="">The 1979 document you cite was Aschenbrenner’s report to the ANSI group after the 2nd SC16 Plenary in London in mid-1979. Since the October 1978 meetings were Working Groups only, Aschenbrenner would only report after an SC meeting.<br class=""><div class=""><br class=""></div><div class="">John<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Jul 3, 2019, at 09:54, Andrew Russell <<a href="mailto:arussell@arussell.org" class="">arussell@arussell.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi everyone - <div class=""><br class=""></div><div class="">You might have seen the CACM featured an article in the most recent issue “On the Hourglass Model” - <a href="https://cacm.acm.org/magazines/2019/7/237714-on-the-hourglass-model/fulltext" class="">https://cacm.acm.org/magazines/2019/7/237714-on-the-hourglass-model/fulltext</a>. </div><div class=""><br class=""></div><div class="">It’s not a history paper, but it raised a history-related question for me. As far as I know the visual representation in question started with a drawing of a margarita glass in 1979, in the context of an OSI committee meeting and the 7-layer model. I reproduced the image on page 214 of my book “Open Standards and the Digital Age” - it’s visible to me here: </div><div class=""><a href="https://books.google.com/books?id=jqroAgAAQBAJ&pg=PA214&lpg=PA214" class="">https://books.google.com/books?id=jqroAgAAQBAJ&pg=PA214&lpg=PA214</a>.</div><div class=""><br class=""></div><div class="">My question for the list has 2 parts:</div><div class="">1) when/where did the margarita glass turn into an hourglass?</div><div class="">2) when/where did the TCP/IP community borrow it from the OSI community? (I’m assuming this is how it happened, would be very interested in evidence or recollections to the contrary)</div><div class=""><br class=""></div><div class="">My hunch, without doing a fresh round of research, is that I should look first to papers by David Clark and co-authors in the 1980s to answer a third question, which is how this illustrated concept morphed into a “Theorem” (as the CACM essay puts it). But that’s just a hunch, and I’d really appreciate pointers or recollections.</div><div class=""><br class=""></div><div class="">Thank you!</div><div class=""><br class=""></div><div class="">Andy</div></div>_______<br class="">internet-history mailing list<br class=""><a href="mailto:internet-history@postel.org" class="">internet-history@postel.org</a><br class="">http://mailman.postel.org/mailman/listinfo/internet-history<br class="">Contact list-owner@postel.org for assistance.<br class=""></div></blockquote></div><br class=""></div></div></body></html>