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Tachymeter.

"Tachymeter" is a slide rule to be equipped on an analog stopwatch. Numerals and graduations are written on the bezel of the watch and it can be used to calculate the speed based on the traveling time or measure the distance based on the speed. And you can read that number directly from the position of the hand.


「タキメーター」はアナログストップウオッチに搭載される計算尺である。ベゼルなどに数字や目盛りが記されていて、移動時間に基づいて速度を計算したり、速度に基づいて距離を測定したりするのに使用し、針の位置から直読が可能となっている。
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