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Japanese: てんぷ

A speed regulator for mechanical timepieces with a balance spring used in portable watches and home clocks. The origin of the word "balance" is unknown. It is a metal ring with a rectangular cross section, with a hairspring (a thin spiral spring) fixed to its axis, and it rotates and oscillates due to the elasticity of the hairspring. The period is determined by the moment of inertia of the ring and the elasticity of the hairspring. The oscillation regulates the rotation of the wheel train via the escapement.
→ Related items Mechanical clocks | Clocks

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

携帯時計，家庭用の時計に用いられたてんぷ式機械時計の調速機。てんぷの語源は不明。軸にひげぜんまい（渦巻状の細いばね）を固定した，断面が長方形の金属製円輪で，ひげぜんまいの弾力により回転振動する。周期は円輪の慣性モーメントとひげぜんまいの弾力できまり一定。振動により脱進機を介して輪列の回転を規正する。
→関連項目機械時計｜時計

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