and form for a compass needle . 115 
force which I have remarked, except by supposing that I had 
inadvertently changed the inclination at which the magnets 
were held, I resolved to try whether a variation of this angle 
produced any considerable difference in the degree of mag- 
netism communicated. For this purpose I re-magnetized the 
needles, by laying the magnets, with their opposite poles 
joined, flat upon the needle, the junction of the magnets be- 
ing upon the centre. They were then separated and drawn 
to the extremities of the needle, the Surface of the needle 
and that of the magnets being in contact the whole time. 
The poles were then joined and the operation repeated, using 
but little pressure. 
Experiment 13. 
Magnets moved flat upon the needle 
with little pressure. 
Directive 
force. 
Parallelogram 
Rhombus - - • 
Pierced rhombus 
1265 
IO48 
1130 
This manner of magnetizing, therefore, appears much su- 
perior to that before employed. 
The needles were again magnetized in the same manner 
as in the last experiment, except that the ends of the mag- 
nets were pressed pretty strongly against the needle. 
