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Old 27th Feb 2007, 6:05 pm   #4
Framer Dave
Rest in Peace
 
Join Date: Dec 2006
Location: Near Wrecsam, North Wales
Posts: 356
Default Re: Screen magnifiers - 40s/50s TVs

Quote:
Originally Posted by BassoonBloke View Post
Hello People,

I have one of these magnifiers at home which has'nt leaked (yet !), but the oil has gone slightly yellow (it's probably been in a window or something for a while in it's past). My one does'nt have a filler hole of any sort, so hopefully it won't leak.:
Thanks for that, everybody. Re. yellowing, both mine are yellowish, but I thought it must be the plastic that had discoloured, not the fluid. I'll draw some out and see if I can tell.

I suppose the magnifying effect is due to the refractive index of the fluid, not the shape of the container. Would glycerol have a similar index to liquid paraffin? Or doesn't it matter much?

Dave
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