Re: [Phys-l] Mercury barometers

[John Denker <jsd@av8n.com>]

Here's an interesting writeup on mercury barometers:
  http://www.charlesedwin.com/mercury.htm

Bottom line:
 -- Some mercury barometers emit no mercury at all.
    It depends on the design.
 -- Otherwise ... If you sat all week in a small room with 
  dozens of mercury barometers, it might approach the 
  NIOSH / OSHA exposure limits.