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A turnbuckle has reverse threads at either end. Turning its center pulls both threaded ends inward at once, taking up slack in the cables.
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A wire loop buried in the pavement creates an electromagnetic field. A car's metal disrupts it, signaling the light that a vehicle is waiting.
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As the cutter head grinds through rock, hydraulic jacks push against the concrete ring segments already installed behind the machine, inching it forward.
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Some systems detect a vehicle through changes in a magnetic field; others use radar, ultrasound, or cameras. The arrival and departure data can feed meters or…
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The moving rail and the steps use separate mechanisms, but their speeds must stay closely matched. Technical specifications allow only a small difference, and…
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Pile drivers hammer concrete pillars deep through soft topsoil until they reach bedrock, giving the building a firm foundation.
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More people on the planet currently have access to a mobile phone than have regular access to a safely managed, working indoor toilet. The United Nations has…
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