Tubes Asylum

quartz

64.12.116.16

In Reply to: RE: I assume it is related to halogen lamps..... posted by astralnavigator on July 02, 2009 at 11:54:03

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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