http://cdn.theatlantic.com/static/in...8_RTR1ECDC.jpg

On May 9, 3:43*am, Bob Boblaw wrote:
http://cdn.theatlantic.com/static/in...8_RTR1EC...Ads not by this site

A dopey bugger if this is genuine.
You can get holes burnt in your retina without a proper mask.
But then there was a box factory full of them in a previous link.

On May 9, 2:38*am, harry wrote:
On May 9, 3:43*am, Bob Boblaw wrote:

http://cdn.theatlantic.com/static/in...8_RTR1EC...not by this site

A dopey bugger if this is genuine.
You can get holes burnt in your retina without a proper mask.
But then there was a box factory full of them in a previous link.

harbor freight sells auto darkening ones so cheap why bother???

On Thu, 9 May 2013 01:35:38 -0700 (PDT), bob haller
wrote:

On May 9, 2:38*am, harry wrote:
On May 9, 3:43*am, Bob Boblaw wrote:

http://cdn.theatlantic.com/static/in...8_RTR1EC...not by this site

A dopey bugger if this is genuine.
You can get holes burnt in your retina without a proper mask.
But then there was a box factory full of them in a previous link.

harbor freight sells auto darkening ones so cheap why bother???

Chances are, this is in some third world country with no HF stores.
OTOH, it may be from their R & D Department.

harry wrote:
On May 9, 3:43 am, Bob Boblaw wrote:
http://cdn.theatlantic.com/static/in...8_RTR1EC...Ads not by this
site

A dopey bugger if this is genuine.
You can get holes burnt in your retina without a proper mask.
But then there was a box factory full of them in a previous link.

Any plastic will greatly reduce uv exposure, but it's obviously got to be
dark enough, but why chance it.

Greg

On May 9, 6:38*pm, gregz wrote:
harry wrote:
On May 9, 3:43 am, Bob Boblaw wrote:
http://cdn.theatlantic.com/static/in..._RTR1EC....not by this
site

A dopey bugger if this is genuine.
You can get holes burnt in your retina without a proper mask.
But then there was a box factory full of them in a previous link.

Any plastic will greatly reduce uv exposure, but it's obviously got to be
dark enough, but why chance it.

Greg

Arc welders should be using a lens shade between 10 to 14. The
sunglasses are probably a 3 shade. The shades don't block radiation
the same across the spectrum (see chart).
http://www.aoa.org/x5364.xml
He's probably getting 1000x more radiation from far UV than he should
and 20x more IR radiation than he should (comparing the transmittance
of shades 3 vs 10) ALL the excess radiation (over what is
recommended) is bad. Excessive IR alone can cause premature
cataracts, etc.

On May 9, 10:44*am, Ed Pawlowski wrote:
On Thu, 9 May 2013 01:35:38 -0700 (PDT), bob haller
wrote:

On May 9, 2:38*am, harry wrote:
On May 9, 3:43*am, Bob Boblaw wrote:

http://cdn.theatlantic.com/static/in...8_RTR1EC....by this site

A dopey bugger if this is genuine.
You can get holes burnt in your retina without a proper mask.
But then there was a box factory full of them in a previous link.

harbor freight sells auto darkening ones so cheap why bother???

Chances are, this is in some third world country with no HF stores.
OTOH, it may be from their R & D Department.

Hah. You just reminded me.
I once saw an Arab electric welding by just shutting his eyes. He
could apparently see the work through his eyelids.
Morroco I think.