F.21 Data Sheet 21

C-Thru, S-96, c.1973

Serial Number or Date Stamp:

Country: USA Primary construction material: pl Case included?: no

Length of 1 decade = 15 in, and overall scale length = 15 in. The largest physical dimension is 6 in.

Front Scales: K D A L [ C B CI ]

Back Scales: [ S L T ]

Notes: from my high school years

References: http://sliderulemuseum.com/Circular.htm

Date Acquired: 08/01/2020