[ih] Hourglass model question

[arussell at arussell.org (Andrew Russell)]

Hi everyone - 

You might have seen the CACM featured an article in the most recent issue ?On the Hourglass Model? - https://cacm.acm.org/magazines/2019/7/237714-on-the-hourglass-model/fulltext <https://cacm.acm.org/magazines/2019/7/237714-on-the-hourglass-model/fulltext>. 

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: 
https://books.google.com/books?id=jqroAgAAQBAJ&pg=PA214&lpg=PA214 <https://books.google.com/books?id=jqroAgAAQBAJ&pg=PA214&lpg=PA214>.

My question for the list has 2 parts:
1) when/where did the margarita glass turn into an hourglass?
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)

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.

Thank you!

Andy
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