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aircraft navigational computer
aircraft navigational computer

aircraft navigational computer

Dateca. 1940-1955
Inventory Number2003-1-0243
ClassificationComputing Rule
Subject
    Maker G. Felsenthal & Sons founded 1940s
    Maker United States Navy founded 1775
    Cultural Region
      Place of Origin
        Dimensions0.5 × 12.1 × 12.1 cm (3/16 × 4 3/4 × 4 3/4 in.)
        Material
          DescriptionInstrument consists of two white plastic discs attached at the center with a metal divot permitting relative rotation. There are various scales printed in black around the circumference of the discs, including "MILES" on the outer disc and "MINUTES" on the inner disc.
          Signedprinted in black on instrument: BU. AERO. U.S. NAVY / AIRCRAFT NAVIGATIONAL / COMPUTER / MARK 8 / F.S.S.C. No. 85-C-1150 / CONTRACT NO. 99820 G. FELSENTHAL & SONS, CHICAGO
          FunctionUsed by the U.S. Navy for altitude correction, air speed correction, speed index.

          Instructions printed on instrument: "FOR / AIR SPEED CORRECTION / On the scale above set the air temperature / opposite the pressure altitude on the base. Read / true air speed on miles scale of the base oppo- / site calibrated air speed on minutes scale (Cali- / brated air speed is the reading of the instrument / corrected for instrumental and installation errors.)"
          ProvenancePrivate Donor, Troy, NY.
          Barth's speed slide rule
          Barth's speed slide rule
          Carl G. Barth
          Date: copyright 1902
          Object number: 1990-4-0030
          Amsler integrator
          Amsler integrator
          Jakob Amsler
          Date: circa 1906
          Accessories: instrument is in four (4) parts; the rail is in own box and is inventory # 2006-1-0002b; letter from Prof. William Brower containing the complete history of ownership and use (missing)
          Object number: 2006-1-0002a
          Barth's speed slide rule
          Barth's speed slide rule
          Carl G. Barth
          Date: copyright 1902
          Object number: 1990-4-0029
          Barth's speed slide rule
          Barth's speed slide rule
          Carl G. Barth
          Date: copyright 1902
          Object number: 1990-4-0026
          Barth's speed slide rule
          Barth's speed slide rule
          Carl G. Barth
          Date: copyright 1902
          Object number: 1990-4-0028
          Barth's speed slide rule
          Barth's speed slide rule
          Carl G. Barth
          Date: copyright 1902
          Object number: 1990-4-0027
          Barth's speed slide rule
          Barth's speed slide rule
          Carl G. Barth
          Date: copyright 1902
          Accessories: bottom of storage box; Instruction booklet (belongs to a different instrument, a time slide rule)
          Object number: 1990-5-0002
          Barth's speed slide rule
          Barth's speed slide rule
          Carl G. Barth
          Date: copyright 1902
          Object number: 1990-4-0031
          Barth's speed slide rule
          Barth's speed slide rule
          Carl G. Barth
          Date: copyright 1902
          Object number: 1990-4-0032
          Barth's speed slide rule
          Barth's speed slide rule
          Carl G. Barth
          Date: copyright 1902
          Object number: 1990-4-0025
          Barth's gear slide rule
          Barth's gear slide rule
          Carl G. Barth
          Date: copyright 1902
          Accessories: storage box; instruction booklet in instrument file
          Object number: 1990-4-0033
          Barth's gear slide rule
          Barth's gear slide rule
          Carl G. Barth
          Date: copyright 1902
          Accessories: storage box; instruction booklet in instrument file
          Object number: 1990-5-0003