F.291 Data Sheet 291

Unique, Navigational, 1943

Serial Number or Date Stamp:

Country: UK Primary construction material: wd Case included?: box

Length of 1 decade = 10 in, and overall scale length = 10 in. The largest physical dimension is 10 in.

Front Scales: 1:1e6 || S A [ B S T C ] D T || 1:5e5

Back Scales:

Notes: Original box from London; Lt. Filipek (1943) ~WWII

References: http://www.mathsinstruments.me.uk/page14.html

Date Acquired: 08/01/2020