14G CHR0N0METRY. 



upon copper, gave signs of very strong electricity, constantly 

 increasing with the temperature till the sulphur melted, at 

 which instant the signs disappeared, 

 aWe e boSes der " After the union of ponderable bodies, in which the electri- 

 have combin- city is seen to fly off in the form of light and heat, the ponder- 

 ed, they can a ^j e bodies are reduced to a state of chemical repose. The 

 be separated ,.,,.. , , . 



only by the elements of the combination can no more be separated, nor be 



electricities restored, to their original form and characters, without the influ- 



acting pecu- _ »,'■'..'.. r , r 



liarly on each ence of a mass of electricity, in a state of charge or ot separa- 



body. tion, as in the operation of the pile. Bat in this case the elec- 



tricities, tending to regain their equilibrium, decompose the 

 combination, by operating each upon its relative constituent 

 part to which it restores its original form and characters. 



(To le Continued) 



XIV, 



Facts and Remarks, upon the Interruption which the situation of 

 the maintaining iveight produces in the rate of a clock, when 

 near the pendulum. By H. K. 



To Mr. Nicholson. 



SIR, 

 Rate of clocks 1TN your Journal for October last, I observed a paper by Mr 

 position of the 



affected by the JL Thomas Reid, on the effect produced on the going of 

 position of the t a ° 



weight, clocks, by the attraction between the weights and the pendu- 



lum. 

 was observ- 'f he effect alluded to, viz. that of the arc of vibration becom- 



died by pro-" m Z ^ ess when the weight is near the ball of the pendulum was 

 fessor remarked some years since, by the late Dr. Hornsby. This 



orn * ¥• gentleman having done me the honour to accompany me in a 

 visit to the observatory at Oxford, pointed out an astronomical 

 clock there, the weight of which he had contrived to pass 

 behind the clock case. He informed me, that he had remarked 

 an irregularity in the going of the clock, when the weight 

 approached the ball of the pendulum, and attributed it to the 



increased 



