Speedy thing goes in, speedy thing comes out.
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Think glass pipe versus glass cylinder or rod. Though, I don’t think the hollow core is fully empty, it has some structure to it.
Source: https://www.rp-photonics.com/hollow_core_fibers.html
I work with fibre and have never stopped to think if it is hollow or not. Thanks for this
How do you weld that?
Absolutely no idea.
