F.75 Data Sheet MJS-p-0428

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FXR, Radio Transmission Line Calculator & Smith Chart, c.1950

Serial Number or Date Stamp:

Country: USA

Primary construction material: pl

Case included?: folder

General Description: Basic circular polyphase slide rule

Length of 1 decade = 28 in, and overall scale length = 28 in. The largest physical dimension is 9 in.

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

Back Scales: SmithChart

Notes: Smith Chart for computing impedance of antenna and radio frequency (RF) transmission line systems; circular slide rule on opposite side

References: https://osgalleries.org/collectors/otnes/info_and_image.cgi?string1=circular_and_spiral&string2=3013

Date Acquired: 05/23/2026