Pressureized Scope? - How do they do that..

[robse]

[color=#000000]Hi, all.

I was just wondering]



Edited By Robse on 1058825188

[seahawk]

I'm not sure on the

I'm not sure on the answer but I found this on a website while doing a quick search.

"2B1. Importance of watertightness. When periscopes are assembled at the factory, the greatest care is used to make sure that the contained nitrogen-air mixture is absolutely free of moisture. A periscope, when new, is charged with dry nitrogen-air mixture at a pressure of 7 1/2 psi and -50 degrees C to -69 degrees C dewpoint. Since the optical qualities of most of the periscopes presently in use are excellent, there is usually no reason for opening the periscope unless water enters. "

It came from an online WW II US Submarine Periscope Manual so it should probably have more information then what I quoted. Here's the link]Submarine Periscope Manual[/url]

[robse]

Thanks, SeaHawk! There's all the

Thanks, SeaHawk! There's all the answers. Pretty impressive tool, a scope..

Thx again, Sir.