What is the distance between the source and destination???

-----Original Message-----
From: Museum discussion list [mailto:[log in to unmask]]On
Behalf Of William Grewe-Mullins
Sent: Wednesday, November 21, 2001 9:29 AM
To: [log in to unmask]
Subject: Laser barriers


I am looking for a source of laser barriers to use in an upcoming
exhibition. Basically, I'd like to protect specimens displayed behind a
minimal physical barrier by adding a laser beam barrier that will set off
an audible alarm when the beam is broken. Sonic curtains are not an option
in this case. Thanks
Wil

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