Remontoire E'scapement for an Astronomical Clock. 409 
j _ by the same motion the lever will be unlocked from the pallet f 
! by the time the roller 7 is fairly out of the way of the wheel; at 
which time the pressure of the tooth against the inclined plane of 
the pallet a, will cause the lever to move toward and strike against 
the pin at p; when the tooth will escape from the pallet a; the 
wheel will move forward half the distance between two teeth, 
and raise the roller ¢, till it rests on the point of the tooth; a 
tooth will come in contact with the inclined plane of the pallet 
let e, as seen in fig. 2, where it will remain till the pendulum 
completes its vibration ; and when it returns from right to left, 
the remontoire weight j will give impulse to the pendulum, till it 
lodges against the wheel behind the tooth on which it formerly 
rested, as seen, fig. 2; the arm k& will raise the roller z, from the 
point of the tooth on which it will find it; immediately the lever 
will be freed from the pallet e; the pressure of a tooth against 
the pallet 6, will cause the lever to strike the pin at 0; the tooth 
will escape from the pallet 6, and the wheel will move forward 
half the distance between two teeth, raising the roller 7 to the 
: point of the tooth; a tooth will come against the pallet a, fig. 1, 
q and cause the lever to lock against the pallet f: the pendulum, 
: after completing its vibration, will again proceed to the right, and 
4 the same movements will be repeated. 
: If in fig. 1, the distance from the pallet a to the fulcrum ¢, is 
ae one-twelfth of an inch, and the length of the lever from ¢ to f 
is three inches; the pressure of the lever against the pallet f will 
e only about one thirty-sixth of the pressure against the pallet a. 
Now, if in connection with this we remember that the distance 
m f,is much shorter than the distance from m to 7, the point 
where the unlocking would be, if made from the scape wheel, 
swe may readily conclude that the resistance to the pendulum in 
i this unlocking is almost nothing compared with that in other es- 
capements. 
- center of the roller as shown in fig. 3. 
es a remontoire weight, it should stop before the tooth comes 
Serres, Vol. XI, No. 33—March, 185]q 52 © 
