TMPROVtD CLOCK. ' 347 



when raised to a sufficient height, it is let go by the pin, improvement 

 and falls on tUe gathering pallet D, which forces it into ^"^ ^f"Jg^'**^** 

 the rack ; it is prevented from rising out of the rack by striking part of 

 the spring F, having got into tlie notch b of the brass clocks, 

 plate E ; the pallet immediately acts on the rack ; for, 

 as the arm C moves from left to tight, it lays hold of a 

 tooth, and carries it along with it by means of the vis 

 inerticc of the pendulum, at the same time the hammer- 

 tail is raised by another tooth of the rack, and on quit- 

 ting it the hammer strikes the bell ; when the arm C re- 

 turns with the gathering pallet from right to left, th« 

 rack is prevented from returning with it by the tooth 

 resting against the end of the hammer-tail, the pallet is 

 then carried over another tooth, and at the next vibra- 

 tion moves the rack and hammer-tail as before ; thus ihey 

 continue to act alternately on each other till the rack is 

 up, and the clock makes one stroke regularly at every 

 other vibration. 



Now, in order to disengage the gathering pallet, there 

 is a pin fixed in the rack at c, and as soon as the last tooth 

 of the rack has got past the hammer-tail, the shoulder of 

 the brass plate E, which is rivetted to the pallet, strikes 

 against the pin c, and lifts it out of the rack, the spring 

 F jumps into the notch a, and prevents it from return- 

 ing ; thus it remains detached, and the pendulum con- 

 tinues to vibrate without any obstruction. The ball of 

 the pendulum weighs about eight pounds thirteen ounces; 

 and the weight 24 pounds. The clock has a dead 

 scapement. 



The objection that may perhaps be made to this clock 

 is, that the striking part disturbs the isochronism of the 

 pendulum; but whoever will take the trouble to try it 

 against another pendulum, of the same length, both be- 

 fore and after it has struck, will find no sensible altera- 

 ation; and even if that were the case, the irregulaiitie* 

 would be periodical, and return to themselves every 

 twelve hours. 



The advantages which I conceive this clock to ha?* 

 over a common clock, are as follow : 



First — That it is not attended with that disagreeable 

 roaring which h frequently heard in the whe«l8 and pini* 



0H9 



