by signs the action of machinery. 263 
minute to that which is indicated by the watch by which the 
clock is set No. 6 , is for the pendulum, which must be held 
aside at its extreme arc until the instant at which the watch 
reaches the time set on the face of the clock ; it must then 
be set free. 
The remaining part of the notation indicates the action of 
every part at all times ; but as the whole cycle of twelve 
hours would occupy too much space, a portion only is given 
about the hour of four : from this the machine may be suf- 
ficiently understood. As an instance of its use, let us enquire 
what movements are taking place at seven seconds after four 
o’clock. On looking down on the left hand side to the time 
just mentioned, we observe between the end of the sixth, and 
end of the seventh second, that the pendulum and crutch 
begin to move from the right to the left, increasing their 
velocity to a maximum, and then diminishing it ; that the 
whole train of wheels of the time part are at rest during the 
greater part of that second, and all move simultaneously a 
little before its termination. The greater part of the train of 
the striking part is moving uniformly ; but two parts the 
cross piece, and the other moving the hammer, being at the 
commencement of this second in a state of motion from right 
to left, suddenly have that motion reversed for a short time : 
this is at the moment of striking: two other pieces, the 
hawk’s bill, and the gathering pallet, appears to act at the 
same moment. 
If the course of movement of any one part is required 
throughout the whole cycle of the machine’s action, we have 
only to follow its indicating line. If it is required to find 
what motions take place at the same time, we have only to 
look along the horizontal line marked by the time specified. 
