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This tool can quickly calculate electrical wire resistance per foot based on wire diameter.

GiGadgets

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988,605 次观看 • 1 个月前 •via X (Twitter)

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Fascinating little Roebling device that is used to quickly calculate electrical wire resistance per foot, based on wire diameter. [📹 thedancherry]

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Ever wonder how we measured electrical resistance before the invention of the modern multimeter? This 19th-century mechanical calculator was the gold standard for telegraph and early power line engineers. Known as a wire gauge resistance meter, it utilized the direct relationship between a wire's diameter and its ability to conduct current. The device features a logarithmic-style scale where each notch corresponds to a specific wire thickness. By finding the perfect fit, the user could instantly read the ohms per foot. It’s a brilliant example of how physical design can solve complex mathematical problems without needing a single battery.

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