to engage a gear
131Double clutch — For the Transformers character see Double Clutch (Transformers). This article is about the driving technique. For the semi automatic transmission with two clutches, see dual clutch transmission. A double clutch (also called a double declutch) is… …
132Wheel train (horology) — In horology, a wheel train (or just train) is the gear train of a mechanical watch or clock.[1] Although the term is used for other types of gear trains, the long history of mechanical timepieces has created a traditional terminology for their… …
