120 MR HARVEY on a Remarkable Case of Magnetic Intensity 



spring box an inch below the centre of the oscillating bar, ix be- 

 ing upwards, the intensity amounting only to 92.22 ; the north 

 pole, at the same time, dipping three degrees. Three coils of 

 the steel-chain were wound round the box. The time-keeper 

 being afterwards moved through a third quadrant, so as to bring 

 the cylinder over the spring of the balance, vi being uppermost, 

 the north pole dipped two degrees, and the intensity amounted 

 to 101.26. And, lastly, by turning the Chronometer through a 

 similar portion of a circle, bringing in upwards, and by this 

 means placing the centre of the oscillating cylinder over the small 

 interval between the balance and the fusee, the intensity fell to 

 79.51. Below the cylinder, in this case, were the arbor of the 

 fusee, and a ratchet and pivot for the same, all of steel, and pos- 

 sessing considerable magnetic power. These results are arranged 

 in the following Table : 



These conclusions bear some analogy, as, indeed, they ought, 

 to those recorded in the preceding Table, the maximum inten- 

 sity corresponding in each case to the position xn, and the mi- 

 nimum to that of in. The positions denoted by vi and ix are 

 also in both cases next to the maximum in point of magnitude. 



The magnetism of the balance and its spring were also power- 

 fully displayed, by raising the Chronometer when vi was upper- 

 most, so as to bring the circumference of the latter within an 

 inch and a quarter of the oscillating cylinder ; the dip being in- 



