^* E W gf BfrtC KK G PART OP At CO'CIC .•' '^ }p3 



leave to inform the Society of fome of the advantages New ftriking 



• re xi • • *• part of a ciock. 



anling irom this new invention. ^ 



Firft, it confifts in a wheel and fly, with fix turns of a 

 fpiral line, cut upon the wheel, for the purpofe of counting 

 'the hours'. The pins below^ this fpiral elevate the hammer, 

 and thofe above are for the ufe of the detent. 



This fingle wheel ferves the purpofe of count wheel, pin 

 wheel, detent wheel, and the fly wheel, and has fix revo- 

 lulions in ftriking the twelve hours. 



Permit me to fuppofe a train of wheels and pinions, ufed 

 in other ftriking parts, to be made without error, and that 

 the wheels and pinions would turn each other without fliake 

 or play. Allowing the above fuppofition to be true, which 

 every mechanic knows it is not, my ftriking part will be 

 found fix times fuperior to others, in ftriking the hours 

 »'l, 2, 5) 7, 10, 11, and twelve times, in ftriking 4, 6, 8, 

 and eighteen times, in ftriking 3, 9, and 12, 

 • I have defignediy made a defedl in the model herewith 

 fent, in ftriking 2 and 3 o'clock, to fliew thit What I have 

 now advanced will, upon the trial, be found to be true. 



In ftriking 2, I have purpofely made an imperfe^ion, 

 equal to the fpace of three teeth of the wheel; and, in 

 ftriking 3, an imperfeftion of nine or ten teeth ; and yet 

 both thefe hours are ftruck perfeftly correct. 



The fly« in clocks turn round, at a mean, about fixty times 

 for every knock of the hammer, but mine turns round only 

 three times for the fame purpofe ; and fuppofe the pivot« 

 were of equal diameters, the influence of oil on them would 

 :be as the number of revolutions in each. * 



It would be better for clocks if they gave no warning at 

 all, but the fnail-piece to raife a weight fomcwhat fimilar 

 to the model now fent for the infpeclion of your refpectable 

 Society. 



Reference to Mr, V rjo iC s Siri/dng Part of his Clock. 

 Plate VI. Fig. 1. 



A. The large wheel, on the face of whieh are funk or cut 

 '<Jlhe"(ix turns of a fpiral. 



B. The fingle worm fcrew, which acts on the above wheel, 

 und moves the fly C. 



* See Curamings's Elements, 



D. 



