10  Beppicker—On the Influence of Magnetism on the Rate of a Chronometer. 
undergoing no sensible alteration from change of position.” Even the three hands 
possessed strong polarity. 
Power of Terrestrial Magnetism = 100. The Oscillating Cylinder one inch above— 
| | - 
1. THE CenTRE oF THE CrysTAL. || 2. Te Mippie or tHE Borrom or Box. 2. THe Mippte or THE Sipe. 
ttt | chert | Matte | Rest | omer |Past | aa | ona | Pa 
North. Intensity. Meaneen| aaiNorthe Intensity. | Mean. uppermost. | Intensity. Mean. 
XII. 90:79 + 0:13 XII. TTP — 14:01 XII. 105°61 + 12°85 
IX. 102°29 + 11:68 IDI 91°34 + 0716 | IDS 89°61 — 815 
VI. 90:69 + 0:08 Walle 101-26 + 10:08 VI. 91:78 — 0:98 
1000, 78:89 -— 11:77 | III. 94:94 + 3°76 1 Of, 84:05 = {sP7/il 
Mean 90:66 —_— Mean 91-18 — Mean 92°76 — 
The following Table shows, in the first and third columns, the ares through 
which the balance was moved, when originally placed, so that the time-screws 
were in the direction of the magnetic meridian. The second and fourth columns 
show the corresponding deviations of a compass, the north pole of which was 
placed near the time-screw with southern polarity. When a needle of more 
delicate construction was employed, an inversion of poles took place the moment 
the time-screws had passed through an are of 90°, and a deviation of the south 
pole immediately followed. 
Balance Motion. | Dern. | Balance Motion. |  Cyppartive 
0° 0° 60 25 
10 dh | 70 BO 
20 _ 83 | 80 364 
30 | 12 | 90 434 
40 | 154 100 494 
50 19 | 110 544 
Observations of another chronometer, which had been constructed with every 
possible care to avoid magnetism, showed, nevertheless, signs of magnetic intensity ; 
