|Slide rules HOME page||COLLECTION||CIRCULAR RULES|
1. This is included in the "circular" rules; although
its outer form is "square" its operation is "circular". Unlike other
circular rules however the scales are operated not directly but by turning small knurled
knobs which engage with the edges of the cursor or the moveable scale as appropriate- in
the top left for the cursor and top right for the scale.
My thanks to Jim Bready for providing the images of the rule and additional information.
||Detail - front view
||Detail - back view
|Manufacturing date||1960 - my estimate|
|Scales||C, D, A, B, CI designated as n,n, n2,n2,1/n
K, S, L, T, ST designated as n3, S, L, T, S&T