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In Reply to: RE: I assume it is related to halogen lamps..... posted by doodlebug on July 02, 2009 at 11:06:48
Yes, but it IS true of halogen lamps! Oil deposits from fingers on halogens can be a problem. It's just - some people, as you say, don't understand that halogens are not vacuum tubes!
Particularly with NOS tubes, anyone who think they were not handled by naked human hands many times along the way before they ended up in their equipment, and that the good folks making the tubes in the factories decades ago were all wearing nice little white gloves, is just plain wrong.
hey-Hey!!!,
Quartz is needed in halogen lamps because the envelope temp is so high. Quartz is also very brittle...fingerprint oil carbonizes, and then the black radiates better than the quartz and resultant thermal expansion stress causes a breakage. Tubes don't get anywhere near this hot, and their glass is much less brittle as well.
A bit ov history...:) Bebe first used quartz windows in his bathysphere because it was stronger than plexiglass. Grandfather and his brother succeeded in convincing him of the use of a test dive( w/o passengers ), and upon return to the surface found the windows had cracked. The FNRS2 and Trieste both used plexi windows w/o issue( to 35k feet below the surface in case of the Trieste).
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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