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The target can be located on the same polar axis that is the mirror's primary rotation axis, or a second, stationary mirror can be used to reflect light from the polar axis toward the target, wherever that might be. This kind of mirror mount and drive is often used with solar cookers, such as Scheffler reflectors.
The classic large Operation On-Target signal mirror is a modular design with four square feet of reflecting area, transported in backpacks and assembled on-site. It consists of four 12"x12" mirrors bolted to a square of plywood with wing bolts and mounted on a light tripod. A small aimable signal mirror is taped to one edge as a sight. [1] [17]
It uses an array of flat, movable mirrors (called heliostats) to focus the sun's rays upon a collector tower (the target). Concentrating Solar Power (CSP) systems are seen as one viable solution for renewable, pollution-free energy. [1] Early designs used these focused rays to heat water and used the resulting steam to power a turbine.
The purpose of mirrors is to reduce network traffic, improve access speed, ensure availability of the original site for technical [2] or political reasons, [3] or provide a real-time backup of the original site. [4] [5] [6] Mirror sites are particularly important in developing countries, where internet access may be slower or less reliable. [7]
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The dot remains on the target even though the viewer's head is moved side to side A reflector sight or reflex sight is an optical sight that allows the user to look through a partially reflecting glass element and see an illuminated projection of an aiming point or some other image superimposed on the field of view .