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  • DanD54 commented on joshcorn's instructable Blüp: The Bubble Notifier2 years ago
    Blüp: The Bubble Notifier

    This is a really nice idea, and well documented. I have an idea for disappearing the brass tube - if you used something like borosilicate glass tube (lab supplies) instead of brass, and a fluid with a similar refractive index like high weight (viscous) silicone oil, the tube would almost disappear in the fluid.

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