[ih] Hourglass model question

[Scott O. Bradner]

as far as I know - the first use of an IP based hourglass was in Realizing the Information Future (1994) 
https://www.nap.edu/catalog/4755/realizing-the-information-future-the-internet-and-beyond

Scott

> On Jul 3, 2019, at 10:29 AM, John Day <jeanjour at comcast.net> wrote:
> 
> 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.
> 
> 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.
> 
> John
> 
>> On Jul 3, 2019, at 09:54, Andrew Russell <arussell at arussell.org> wrote:
>> 
>> 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. 
>> 
>> 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.
>> 
>> 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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