1. Lighting. A mounting mechanism for a luminaire, particularly in a TV/film studio, that allows for easy height adjustability. Usually made by studio fixture manufacturers: Desisti, Manfrotto, Matthews, Bogen, among others. Some touring rock shows use automated varieties, always a custom job.
http://www.silverlakephoto.com/product.php?productid=17148
2. A method of mechanically reducing/enlarging a tracing.
http://users.hubwest.com/hubert/mrscience/pantograph.html
http://www.silverlakephoto.com/product.php?productid=17148
2. A method of mechanically reducing/enlarging a tracing.
http://users.hubwest.com/hubert/mrscience/pantograph.html