Lever
131Lever escapement — The lever escapement is a key component of the typical movement found in most mechanical wristwatches, pocket watches and many small mechanical non pendulum clocks. The invention of the lever escapement is attributed to Thomas Mudge, and its… …
132Lever frame — Mechanical railway signalling installations rely on lever frames for their operation to interlock the signals and points to allow the safe operation of trains in the area the signals control. Located in the signal box, the levers are operated by… …
