It consists of a narrow tube that rests on the operator's nose.

ECONOMIST: Monitor

Dr Garner and his team let each of their mice, 36 males and as many females from three strains commonly used in trials, roam free in two cages connected by a narrow tube.

ECONOMIST: ��and they may return the favour

When the rubber sack makes contact with an object, whether a glass, a pen, or other hard item, a narrow inner tube sucks a small percentage of air out of the sack, making it contract and conform to the shape of the object it touches.

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When nearly 30 years ago Dr. Jacob Fraden invented an ear thermometer working on this second principle, the infrared light sensor was so large that he needed a narrow gold-plated reflective tube to channel the light from the ear drum to the sensor.

FORBES: Body temperature.

Inside a metal-clad tower at the gas technology Institute in suburban Des Plaines, Ill. sits a narrow, 40-foot steel tube bristling with instrumentation ports and pressurized pipes.

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Once inside, the hostess ushers you behind a hidden door and down a narrow stairway that leads to a candlelit brick basement, roughly the size of a Tube carriage.

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