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Close up photograph of an old vacuum tube.

A vacuum tube is a device that controls electric current through a vacuum in a sealed container. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. Invented in about 1910, vacuum tubes were a basic component for electronics throughout the first half of the century, which saw the…

Close up photograph of an old vacuum tube.

A vacuum tube is a device that controls electric current through a vacuum in a sealed container. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. Invented in about 1910, vacuum tubes were a basic component for electronics throughout the first half of the century, which saw the…

Close up photograph of an old vacuum tube.

A vacuum tube is a device that controls electric current through a vacuum in a sealed container. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. Invented in about 1910, vacuum tubes were a basic component for electronics throughout the first half of the century, which saw the…

Close up photograph of an old vacuum tube.

A vacuum tube is a device that controls electric current through a vacuum in a sealed container. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. Invented in about 1910, vacuum tubes were a basic component for electronics throughout the first half of the century, which saw the…

A close up photograph of a group of vacuum tubes.

A vacuum tube is a device that controls electric current through a vacuum in a sealed container. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. Invented in about 1910, vacuum tubes were a basic component for electronics throughout the first half of the century, which saw the…

Close up photograph of one of the two large telescopes at the Chabot Space Center in Oakland, California. This 8″ refracting telescope is named Leah and was built by Alvin Clark & Sons in 1883. It features a German equatorial mount. It was donated by Anthony Chabot for public use and education.

Available in various sizes with or without mattes and frames.

Close up photograph of old computer circuit boards.

Available in various sizes with or without mattes and frames.

Close up photograph of an old vacuum tube.

A vacuum tube is a device that controls electric current through a vacuum in a sealed container. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. Invented in about 1910, vacuum tubes were a basic component for electronics throughout the first half of the century, which saw the…

Close up photograph of an old vacuum tube.

A vacuum tube is a device that controls electric current through a vacuum in a sealed container. Vacuum tubes mostly rely on thermionic emission of electrons from a hot filament or a cathode heated by the filament. Invented in about 1910, vacuum tubes were a basic component for electronics throughout the first half of the century, which saw the…

Close up photograph of Charles Babbage’s difference engine from the late 1800’s.

Available in various sizes with or without mattes and frames.

Close up photograph of Charles Babbage’s difference engine from the late 1800’s.

Available in various sizes with or without mattes and frames.

It was decided to go with the “headlight” shape that the Soyuz uses—a hemispherical forward area joined by a barely angled conical section (seven degrees) to a classic spherical section heat shield. This shape allows a small amount of lift to be generated due to the unequal weight distribution. The nickname was thought up at a time when nearly every headlight was circular.

“The Soyuz is a flying…