______________________________. In 1864, another French scientist, Henri Regnault, devised a way to measure the speed of sound automatically, again by using a gun, but without relying on human reaction time. Regnault covered a rotating cylinder with paper, and positioned a pen to draw a line as it turned. Next, he wired the pen to two electrical circuits, placing one in front of the gun some distance away, and the second near the cylinder, threaded through a diaphragm sensitive to sound.1864年,另一位法国科学家亨利`勒尼奥发明了一种自动测量声速的方法,他还是用枪来测量,但是这次并没有依靠人的反应时间.勒尼奥用白纸环绕过一个旋转圆筒,并在上面放置一只笔来在纸上画线记录.然后,他通过电线将笔接入两条电路中,一条电路放在枪口前的远处某一点上,另一条放在圆筒附近,使之穿过声敏膜片.
发表于 2013-1-8 11:25
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发表于 2013-1-8 18:21
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