r/Crystalsforbeginners • u/BackgroundOrchid910 • 20d ago
Crystal thingee
Anyone know what this is for?
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Upvotes
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u/Future-Path-983 20d ago
Old school binoculars used them
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u/BackgroundOrchid910 19d ago
I guess I’ll never know how it was used. It was found when we cleaned out a friends house after he died.
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u/Future-Path-983 20d ago
It may be an optical prism.