A method to measure the resonant frequencies of sound in cylindrical and conical hollow is presented. Experimental data based on this method coincide with those provided by theoretical formula.

提出一种测量圆柱和圆锥状空腔声共振频率的方法，由微机和信号处理板配合构成的系统完成频响曲线的测量和运算，实验得到的数据和理论计算值相吻合。

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There are no fixed walls, and each deck is hollow, allowing technicians to run compressed air, electricity and data feeds to wherever they are needed.

ECONOMIST: The future on display