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History
E6B
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The E6B flight computer is a form of circular slide rule used in aviation. It is an instance of an analog calculating device still being used in the 21st century.
The front of a metal E6B
The front of a metal E6B
An E6B flight computer commonly used by student pilots.
An E6B flight computer commonly used by student pilots.
Closeup photo of a metal E-6B
Closeup photo of a metal E-6B
Closeup photo of a cardboard E6B
Closeup photo of a cardboard E6B
Slide rule
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A slide rule is a hand-operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry. It is one of the simplest analog computers.
Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig)
Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig)
Cursor on a slide rule
Cursor on a slide rule
This slide rule is positioned to yield several values: From C scale to D scale (multiply by 2), from D scale to C scale (divide by 2), A and B scales
This slide rule is positioned to yield several values: From C scale to D scale (multiply by 2), from D scale to C scale (divide by 2), A and B scales (multiply and divide by 4), A and D scales (squares and square roots).
A 7-foot (2.1 m) teaching slide rule compared to a normal-sized model
A 7-foot (2.1 m) teaching slide rule compared to a normal-sized model