85 
MM. Van Beek, Van Rees, and Moll. 
9. A brass-wire was bent as ABC, Plate V. Fig. 8. Over this 
was laid a glass-plate, and on this a needle ahcd. The end A of 
the brass-wire being connected with the positive part of the bat- 
tery, and B with the negative, the discharge effected, the needle 
was found to have acquired three magnetic poles, ab and cd be- 
ing south poles, and 5 c, the middle of the needle, a north pole. 
10. The same experiment repeated, with the needle under, and 
the brass-wire above the glass. The ends ah and cd were now 
north poles, and the middle, 5 c, a south pole. 
11. A brass-wire AB, was bent as in Fig. 9. On this was laid 
a steel-wire CD, a glass-plate being between them. The end A 
was connected with the positive, and B with the negative side of 
the battery. This battery was thrice discharged. The steel had 
acquired as many poles as the brass-wire made turns. They are 
marked in the figure by N north, and S south poles. 
IS. The same experiment as the former, only the steel-wire 
undermost, then the glass, and next the connecting-wire. W^here- 
ever in the former experiment a north pole was formed, there was 
now a south pole, and reciprocally. It'was found advantageous 
in these experiments to employ dn-foil attached against the glass- ^ 
plate, instead of brass- wire. 
18. A needle was placed in the same direction, or parallel to 
the connecting-wire, a glass-plate being between them. The 
needle acquired no magnetism, though the battery was repeated- 
ly discharged. 
14. A steel magnetic-neQdXe was placed parallel to the con- 
necting-wire, and above it a glass-plate between them. After 
repeated discharges of the battery, the needle was found to have 
lost its magnetism. 
15. The electric battery was repeatedly discharged through 
a magnetic needle. The needle lost its magnetism. 
It is quite unnecessary to state, that many of these experi- 
ments have been made before by others; but as much uncertainty 
prevails amongst philosophers respecting the result, we thought it 
advisable to transmit you the whole series, of which of course 
you will make whatever tise you please. I am, &c. 
Uteecht, 29^5 Sep. 18^1. G. Moll. 
