Computer, Slide Rule, True Airspeed

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This is a special purpose slide rule, which was used by pilots to determine true airspeed, based on indicated air speed, altitude, and other instrument readings. It is typical of the many specialized slide rules used for air navigation and flight management, before the advent of electronic calculators and satellite-based navigation systems.

The slide rule was found with a collection of paper archives that were donated to the Smithsonian in 1957.

Bequest of the Estate of E.L. Jones.

Country of Origin
United States of America

Manufacturer
G. Felsenthal & Sons Inc.

Type
INSTRUMENTS-Computers, General Purpose

Materials
Plastic
Ink
Steel
Non-Magnetic Metal Alloy
Paint
Dimensions
3-D (Diameter x Depth): 0.6 × 20.3cm (1/4 × 8 in.)
Storage: 25.4 × 5.7 × 25.4cm (10 in. × 2 1/4 in. × 10 in.)

This is a special purpose slide rule, which was used by pilots to determine true airspeed, based on indicated air speed, altitude, and other instrument readings. It is typical of the many specialized slide rules used for air navigation and flight management, before the advent of electronic calculators and satellite-based navigation systems.

The slide rule was found with a collection of paper archives that were donated to the Smithsonian in 1957.

Bequest of the Estate of E.L. Jones.

Country of Origin
United States of America

Manufacturer
G. Felsenthal & Sons Inc.

Type
INSTRUMENTS-Computers, General Purpose

Materials
Plastic
Ink
Steel
Non-Magnetic Metal Alloy
Paint
Dimensions
3-D (Diameter x Depth): 0.6 × 20.3cm (1/4 × 8 in.)
Storage: 25.4 × 5.7 × 25.4cm (10 in. × 2 1/4 in. × 10 in.)

ID: A19970199000