Keuffel and Esser 4093-3

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Keuffel and Esser Model 4093-3 Log Log Duplex Vector

Obverse
Obverse
Reverse
Reverse
  • Type: Hyperbolic Log Log Duplex
  • Size: 10 Inches / 25 cm
  • Material: Mahogany and celluloid
  • Scales:
    • Front: L LL0 DF [ CF B CI C ] D LL3 LL2
    • Back: Sh1 Sh2 Th [ SI1 SI2 TI ] D S T
  • HvH: 4338

Includes scales for hyperbolic sines and tangents, and inverted circular sine and tangent scales to help with polar/rectangular coordinate conversions. The LL0 scale has the discontinuity at e-0.3. See the 4092-3 for a further description. LL0 is read against the B scale.

Dated about 1935 based on serial number, 521193, and cursor style.

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