Front Matter Pages i-xxiv. Pages Astronomical Observations. Design Methods and Project Management. Telescope Optics. Stray Light Control. Telescope Structure and Mechanisms. Pointing and Control. Active and Adaptive Optics.
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View All. That New Yarn?! Feature Video The Office of Science has a library of videos that showcases our research. The wire is very efficient and robust. In the UK, the bars front-of-house audience side of the proscenium arch are usually given names e. See PLAN. In the US, the term "elevation" refers to a Front elevation. A Rear elevation shows backs of scenic elements. A side view of a set is known as a "section". Emergency Lighting systems should be checked regularly as required by local licencing authorities. It's especially important to consider power cuts when using non-theatre spaces especially outdoor spaces for performances.
END ON Traditional audience seating layout where the audience is looking at the stage from the same direction. This seating layout is that of a Proscenium Arch theatre. Also known as Proscenium Staging. The end-on stage can be split into 9 areas: upstage right, upstage centre, upstage left, centre stage right, centre stage, centre stage left, downstage right, downstage centre, downstage left. More on Ghost Light. See also LEKO.
See also ERS. ESTA website. ETC website. ETHERNET Computer networking protocol which is installed on many new lighting desks, to allow networking between the main desk, dimmers, and remote desks around the theatre. New legislation in Europe means that the word 'EXIT' has been removed from these signs to be replaced by 'Running Man', known more politically correctly as 'Person moving purposefully'. The trademark Expressionist effects were often achieved through distortion. EYE CANDY Lighting equipment used especially at live music events to look good to the audience or the camera, rather than being used to light the performers.
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Eye Candy equipment provides limited functional light. Abbreviation for Fade to Blackout. FADE A fade is an increase, diminishment or change in lighting or sound level. A snap fade is an instant change. A slow fade could be anything from 5 seconds to a few minutes or even more, for a naturalistic sunset lighting effect. A quick fade is a couple of seconds long.
A fade out takes the lighting state to blackout or a particular sound to silence.
A fade in does the opposite. A crossfade smoothly transitions from one state to another, without going through darkness or silence for sound. The Up fade time refers to the time it takes dimmer levels to rise to their new positions.
The Down fade time refers to the time for dimmer levels falling to their new positions. FEED 1 A power supply to a piece of equipment or installation is termed a 'feed'. Sound equipment and sensitive computer equipment should have a clean feed - that is, a supply that is free from interference from other equipment.
A video relay of the conductor to screens in the wings is known as a Conductor Feed, etc. Available in multi-circuit form so that the lamps can be 'chased'. Fibre Optics are used mostly in communication, but find theatre applications in star cloths which are black backcloths with the ends of optical fibres poked through, to create a mass of pin pricks of light.
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A large bundle or harness of fibres may be fed from one light source, sometimes with a motorised colour or flicker wheel. New technology enables digital sound signals to be sent down optical fibres, replacing heavy and expensive multicore cables. Most profile lanterns have an adjustable field.
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A Flat field has an even distribution, a peak field has a 'hot spot' in the centre of the beam. A flat field is essential when using gobos. See Profile. Another great leap forward!. Known in the UK as LX1. The next bar is known as Second Electric, and so on.
FIT-UP Initial assembly on stage of a production's hardware, including hanging scenery, building trucks etc. Used instead of "instrument", "lantern" or "luminaire" due to the added complexity of the equipment and the need for additional control connections. Flagging is particularly useful in high ambient light levels.
Also known as a flash pod or firing pod. German: Startbox.
Some Flash buttons on submasters can be set to latch ie they stay on when pushed, until they are pushed again. Sometimes known as a Bump Button. The paper or cotton made from nitrocellulose burns almost instantly leaving no ash or residue. It should be stored wet, and allowed to dry out just before use. Flightcases are very strong, and have reinforced corners and edges. Care should be taken when lifting flightcases as they can be very heavy. The term comes from their original use in protecting delicate equipment when being loaded into air transport and being both very strong and relatively lightweight.
Additional information by Chris Higgs. Floods are used in battens, or singly to light cycloramas or large areas of the stage.