I thought I saw a ruler edge on the slide rule and maybe it was a Hughes Owen 1771.  I would be amazed if the Canadian engineers needed just a basic slide rule.  I don't know what other HO models could have been used on that stock.  If you stay on that link several videos come up.  One vid has one of the engineers being interviewed and he produces a SR with a cursor and it has a ruler edge.

Les

--- On Thu, 4/15/10, Eriugena <eriugena@...> wrote:

From: Eriugena <eriugena@...>
Subject: RE: SR slide rule sighting - calculation helped the Apollo 13 mission return to
To: sliderule@yahoogroups.com
Date: Thursday, April 15, 2010, 12:32 AM







 









Dear Marion,



Thank you for answering in my question. Somehow, it looked thicker than my

Versalog.



--David

























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