( P2 ) 
with its End the wrong Way. Their Diameters were 
about ^ of an Inch, and their Lengths about iz ^Inches 
good Meafure. I hardned and cleanfed them as I did 
the Wires, but one of them happening to break by a 
Fall in touching, I got it fupplied, and, for Fear of 
fuch another Accident, reduced them to almoft a blue 
Colour. I laid them one after another in a Trench 
planed for them, in a long Piece of Wood about the 
Depth of half their Diameter, putting their marked 
Ends all one Way: I made a Hole in the Trench a few 
Inches from one End of the Piece of Wood, and put a 
Pin in it to keep the Bars from Hiding to the Ground, 
and elevated the other End till it was, as I guelTed, in 
the magnetical Line. I then touched them with two 
of my Magnets as before, and this I found the beft 
Way of all. When they were finidied, and armed 
with proper Armour, the North Pole lifted above half 
a Year after Ifej Troj/, and the South Pole conhdera- 
bly more. In making one of thefe, I met with an odd 
Accident ; for after 1 had begun to touch it, appre- 
hending it was a fmall Matter bigger than the reft, I 
attempted to mend it on a Grinding-Hone, whofe Axes 
were direded about 14 or 1 5 Degrees from Eafl towards 
North, and from Weft towards South. I was not care- 
ful to keep its Poles the proper Way in grinding, but 
held the Bar fometimes a-crofs to the Stone, which 
would make it jar, at other times, with the North Pole 
toward the North. Afterward I touched it again with 
the reft, but could not give it an Attraftion equal to that 
of the others. I happened to try with my Dial-Needle 
whether the Change of Polarity was in the very Mid- 
‘ die of the Bars, or nearer to one End than the other, 
and in this Bar found feveral Polarities contrary to my 
Ex- 
