F.249 Data Sheet 249

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Pickett, N1010-ES Trig Demonstration, c.1958

Serial Number or Date Stamp:

Country: USA

Primary construction material: wd

Case included?: no

Length of 1 decade = 40 in, and overall scale length = 40 in. The largest physical dimension is 48 in.

Front Scales: K A [ B ST T S C ] D DI

Back Scales: L DF [ CF CIF CI C ] D DI Ln

Notes: Demonstration rule; originally used in Michigan high school; 1/2 in x 9 1/2 in x 48 in

References: https://webmuseum.mit.edu/detail.php?module=objects&type=related&kv=131608.

Date Acquired: 07/31/2021