Rotational speed meter - Rotational speed meter

Japanese: 回転式速さ計 - かいてんしきはやさけい
Rotational speed meter - Rotational speed meter

...There are rotary speedometers that measure wind speed and the speed of water flow, and speedometers that use pitot tubes that can be attached to aircraft and ships. Rotary speedometers have a cup or a propeller attached to the end of an arm, and the speed of the flow is measured by knowing the number of rotations per unit time. Pitot tubes determine the speed of the flow from the pressure difference between the static pressure and the pressure at an opening in the flow, and are used as flow speedometers on aircraft and high-speed ships. ...

*Some of the terminology that refers to "rotary speedometers" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…風の速さや水の流れの速さを測定する回転式の速さ計や,航空機,船などにとりつけるピトー管などを応用した速さ計がある。回転式速さ計は,腕の先端にカップをつけたものやプロペラをつけたもので,その単位時間当りの回転数を知って流れの速さを測定する。ピトー管は,流れに対して,開口をもった部分の圧力と静圧との差圧から速度を求めるもので,航空機や高速船に対流体速さ計として使用されている。…

※「回転式速さ計」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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