"B a r r y" wrote in message
.. .
George wrote:

I still have a couple of the less common circular types.

They still sell circular slide rules every day!

http://www.sportys.com/acb/showdetl.cfm?DID=19&CATID=171&Product_ID=1197&coun t=1&Pcount=2&DETAIL=1


Ayup, my old Jeppeson CR-3 lived in the lower left leg pocket of my flight
suit for years. It's only incidentally a slide rule, however. I liked it
because it had both polar and rectangular drift methods on the wind face.
http://aviationaccessories.net/pro36406.html

The aluminum E6B type Sam gave me was unnecessarily bulky, and you had to
slip and slide....