Circular Slide Rule

[rprosperi]

(12-01-2024 06:17 PM)SlideRule Wrote:  Mine is a Model 600-ST w/ Inserts ST, CE, MM, & EE. The manual is 3" x 4" w/ 32 pages from front to rear cover.

BEST!
SlideRule

Do you have 4 units, with one of those in each unit?

I've long wondered what the "ST" stands for, along with the others. It's easy to guess:

EE=Electrical Engineer
MM=Mechanical / Maintenance
CE=Chemical Engineer
ST=Scientific / Technician

etc. but the content does not always align with guessed names. Perhaps I need to re-read the manual??

Also, what is the star for? It's present on the upper right corner on one side of all of them, but there's no analogous symbol on the frame to suggest which position is "right". Perhaps a quick way to see at a glance which side is "up" when first extracting it??