Draw
The reliability of the modern lever escapement depends upon draw; the pallets are angled so that the escape wheel must recoil a small amount during the unlocking. The draw holds the lever against the banking during the detached portion of the operating cycle. Draw angle is typically about 15 degrees to the radial.
Early lever escapements lacked draw (indeed some makers considered it injurious as a cause of extra friction in unlocking); as a result a jolt could result in the escapement unlocking.
Read more about this topic: Lever Escapement
Famous quotes containing the word draw:
“Its largely the luck of the draw as to what type of temperament your child has.”
—Lawrence Kutner (20th century)
“For my enemy is dead, a man divine as myself is dead,
I look where he lies white-faced and still in the
coffinI draw near,
Bend down and touch lightly with my lips the white face in the
coffin.”
—Walt Whitman (18191892)
“Art and ideology often interact on each other; but the plain fact is that both spring from a common source. Both draw on human experience to explain mankind to itself; both attempt, in very different ways, to assemble coherence from seemingly unrelated phenomena; both stand guard for us against chaos.”
—Kenneth Tynan (19271980)