282 Rev. Mr Scoresby on Magnetism. 



Experiment 3. — For the support of small Wires and Nails 

 upon each other'^s extremities or points. 



With the large bars, four inches apart, iron-pins (the com- 

 mon black pins of the shops) will stand on each other two inches 

 below the upper magnet, or three or more in a vertical series, 

 firmly adhering to each other, and yet vibrating freely on their 

 supporting point, whenever a small magnet or piece of iron is 

 brought near them, a, 6, c, PI. IV. Fig. 16. represent differ- 

 ent series of pins ; d a key supported on the point of a nail, 

 and e, two polished nails. 



Experiment 4. — For the support of different articles in an up- 

 right series. 



The variety of amusing series capable of being sustained un- 

 der this arrangement is evidently unlimited. The forms and 

 groups represented in PI. IV. Fig. 17. may serve as specimens 

 of what may be accomplished, with the articles only previously 

 in use. The form represented at a is produced by a nail, with 

 two half links of iron-wire suspended on its point. 6 is a half 

 link of iron on the point of a nail supporting four balls near the 

 upper magnet. Xbe next form c represents six half links or a 

 chain of three full links, sustained vertically, d consists of three 

 balls upon a half link, e exhibits three balls upon the point of 

 a nail, y represents a nail of two inches on its point, which will 

 not stand alone ; but when the head is set round with black pins, 

 though the heads of these are nearly an inch from the upper 

 magnet, the whole is freely sustained. The form represented 

 at g consists of a two-inch nail, on the point of which is an iron 

 ball, and that ball set round with black pins, like the plume of 

 the thistle. 



Ji«q« ^mm 



