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| Bed of nails ： ウィキペディア英語版 |
Bed of nails
A bed of nails is an oblong piece of wood, the size of a bed, with nails pointing upwards out of it.〔(【引用サイトリンク】title=Phun Physics - Demonstrations )〕 It appears to the spectator that anyone lying on this "bed" would be injured by the nails, but this is not so. Assuming the nails are numerous enough, the weight is distributed between them such that the pressure exerted by each nail is not enough to puncture the person's skin.
==Uses==
One use of such a device is for magic tricks or physics demonstrations. A famous example requires a volunteer to lie on a bed of several thousand nails, with a board on top of him. Cinder blocks are placed on the board and then smashed with a sledgehammer. Despite the seemingly unavoidable force, the volunteer is not harmed: the force from the blow is spread among the thousands of nails, resulting in reduced pressure;〔(【引用サイトリンク】title=Bed of Nails )〕 the breaking of the blocks also dissipates much of the energy from the hammer. This demonstration of the principles of weight distribution requires that the weight of the volunteer be spread over as many nails as possible. The most dangerous part is the moment of lying down or getting up, when one's weight may briefly be supported on only a few nails. Some "beds" have rails mounted at the sides to help users lie down and get up safely.
The bed of nails is used by some for meditation, particularly in Asia, and for certain health benefits, such as back pain relief, see acupressure mat.〔(【引用サイトリンク】title=About Bed of Nails )〕
Less traditional settings, such as science centers, may use an electronic retractable bed of nails, where the user lies on a flat plastic bed with holes in it, and can then activate the machine to have nails rise up all at once. The nails should retract before getting off the bed. This retraction eliminates the most dangerous part of a traditional bed of nails, getting on and off the bed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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