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Former President of Russia Dmitry Medvedev's videoblog posted after his visit to Latin America in November 2008.

Illustration of a simple three-axis gimbal set; the center ring can be vertically fixed.

A gimbal is a pivoted support that permits rotation of an object about an axis.

A set of three gimbals, one mounted on the other with orthogonal pivot axes, may be used to allow an object mounted on the innermost gimbal to remain independent of the rotation of its support (e.g. vertical in the first animation).

For example, on a ship, the gyroscopes, shipboard compasses, stoves, and even drink holders typically use gimbals to keep them upright with respect to the horizon despite the ship's pitching and yawing.

Shure Brothers microphone, model 55s, Multi-Impedance "Small Unidyne" Dynamic from 1951.

A microphone, colloquially called mic or mike, is a transducer that converts sound into an electrical signal.

Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, motion picture production, live and recorded audio engineering, sound recording, two-way radios, megaphones, and radio and television broadcasting.

They are also used in computers for recording voice, speech recognition, VoIP, and for other purposes such as ultrasonic sensors or knock sensors.

Young George Washington using a surveyor's tripod.

A tripod is a portable three-legged frame or stand, used as a platform for supporting the weight and maintaining the stability of some other object.

The three-legged (triangular stance) design provides good stability against gravitational loads as well as horizontal shear forces, and better leverage for resisting tipping over due to lateral forces can be achieved by spreading the legs away from the vertical centre.

Leica Camera (1950s).

Hasselblad 500 C/M with Zeiss lens.

A camera is an optical instrument that captures images.

Most cameras can capture 2D images, while some more advanced models can capture 3D images.

At a basic level, most cameras consist of a sealed box (the camera body), with a small hole (the aperture) that allows light to pass through and capture an image on a light-sensitive surface (usually a digital sensor or photographic film).

Cameras have various mechanisms to control how light falls onto the light-sensitive surface, including lenses that focus the light and a shutter that determines the amount of time the photosensitive surface is exposed to the light.