K&E N-4102 Surveyor's Duplex

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Country of manufacture: USA,            Date of manufacture: ____, Serial No.: 288872
Overall length: 56.5 cm,          Width: 4.1 cm,           Weight: 180.4 gms
Materials: Open form duplex; celluloid laminate over mahogany
Cursor: 3.0 X 5.1 X 1.3 cms; plastic runners, metal framed glass lens; lines = single hairline, front and back
Scales: 14, specialized
Front: D, sin d [ cos² & h, C, tan ] tan I, Az
Back: VERT (½ sin 2α), A [ B, CI, C ] D, VERT (½ sin 2α)
Gauge Marks: [π, 785 ]
Condition: C5 (Signs of normal use; but one cursor runner cracked slightly because of overtightening screw or too large replcement screw )
Came with: Original black leather and cardboard case

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