Mirror galvanometer
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A mirror galvanometer is an ammeter that indicates it has sensed an electric current by deflecting a light beam with a mirror. The beam of light projected on a scale acts as a long massless pointer. I
Thomson mirror galvanometer of tripod type, from around 1900
Galvanometer by H.W. Sullivan, London. Late 19th or early 20th century. This galvanometer was used at the transatlantic cable station, Halifax, NS, Canada
Modern mirror galvanometer from Scanlab
A moving coil galvanometer with its glass cover separated and mirror absent
Laser lighting display
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A laser lighting display or laser light show involves the use of laser light to entertain an audience. A laser light show may consist only of projected laser beams set to music, or may accompany anoth
A laser show is a live multimedia performance.
Copper vapor laser in operation. Seen in South Florida in February 2006.
Muse on stage at Outside Lands Music and Arts Festival in San Francisco, 13 August 2011