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T
THROW
Distance between a light source (e.g. lantern or projector) and the actor or
object being lit.
THYRISTOR
Also known as an SCR (Silicon Controlled Rectifier). An electronic switch
which will pass current when triggered until the current passing through it
falls to zero. Essential component of stage lighting dimmers.
TILT
1) Up and down (vertical) movement of a lantern, camera or moving light.
TIME
The facility on memory lighting boards for playing back timed fades at the
touch of a button.
TOP HAT
Also known as HIGH HAT or SNOOT. Cylinder of metal inserted into color
runners on the front of a parcan or other lantern to limit spill light.
TRANSFORMATION
An instant scene change, often effected by exploiting the varying
transparency of gauze under different lighting conditions.
TRIAC
(Triode Alternating Current switch) Electronic Semiconductor device which is
an integral part of modern dimmers. When a current is applied to a triac, it
starts conducting, and continues until the current passing through it falls
to zero. Whereas a thyristor can only conduct half of the AC wave, a triac
(as long as it's triggered at the appropriate point) will conduct both
halves of the wave.
TRIPE (BUNDLE)
Bunch of cables tied or taped together into a single unit.
TRS
1) Tough Rubber Sheath. Jargon for any Rubber-sheathed mains cable.
2) Tip Ring Sleeve. The three contacts on a stereo jack audio connector.
TRUNKING
Metal or plastic wall-mounted enclosure for cables. Box shaped in
cross-section.
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