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Motor - A hoist is a device used for lifting or lowering a load by means of a drum or barrel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use ch. Used . ain, fiber or wire rope as its lifting medium.

A hoist normally is used for lifting (near vertical) and a winch is normally used for pulling (near horizontal). . Used .

Moving Heads - A moving head is an intelligent light mounted on a moving yoke and generally remotely controlled by a lighting control console or preprogrammed to perform a large variety of effects and operations. A . Used . single moving head luminary can replace the functions of many conventional lights and can often perform tasks conventional lights can not. Most modern moving head luminaries utilize DMX-512 s. Used . ignals for control, but some can be controlled by way of analog signals as well.

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Stages - A stage is a designated space for the performance of theatrical productions or other live events. Some stages are permanent structures in theaters, but often stages are temporary structures built for . Used . outdoor events and can range is size from small 20 to 30 square foot structures to very large arena sized stages assembled from many components.. Used . ...

Wavelength - The distance from one point, usually the crest, on a vibrating wave to the same point on the next wave. The shorter the wavelength the higher the frequency and the more directional the wave and vice . Used . versa. Commonly designated by the Greek letter lambda (?), wavelengths are usually measured in Angstroms.. Used . ...

Fresnel Lens - A Fresnel lens is a type of lens invented by Augustin-Jean Fresnel. Originally developed for lighthouses, the design enables the construction of lenses of large size and short focal length without th. Used . e weight and volume of material which would be required in a lens of conventional design.

The Fresnel lens (often pronounced FREZ-nell but usually the original fre-NELL in theatr. Used . ical and motion picture lighting applications) reduces the amount of material required compared to a conventional spherical lens by breaking the lens into a set of concentric annular sections known as Fresnel