中央大学法学部通信教育課程
Word 用レポート原稿用紙(ダウンロード用)
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201904-1
(1)英文
Now for the other part of the machine. Here is a brass cylinder grooved something
like the spiral part of a screw, only much finer. I wrap a sheet of tin foil around
the cylinder and shove the mouthpiece up to it so that the tiny steel p oint touches
the tin foil above one of the grooves. I then turn the cylinder with a crank and talk
into the mouthpiece.
The vibrations arouse the disc and the steel point pricks the tin foi l, ...