370 On the best Kind of Steel und Form 
unequal, so as to be touched hy the magnet in very few places, 
I filed it flat, and having reduced the large parallelogram to, the 
same weizlit, they were magnetised by joining the magnets, 
placing them perpendicularly on the centre of the needle, se- 
parating their lower extremities, and carrying them to each end 
of the needle, the upper ends remaining in contact. 
Experiment 28. Direc. ive force. 
Small parallelogram .. 0... 21025 
Large parallelogram... ..  « L150 
The needles were next magnetised, according to the method 
of Du Hamel, the magnets being inclined at an angle of about 
45 degrees, and carried, as before, from the centre to the ends of 
the needle. 
Experiment 29. Directive force. 
Small parallelogram .. ..  .. 1070 
Large parallelogram .. «2 «. 1170 
The magnets forming with the needle an angle of about 20 
degrees. 
Experiment 30. Directive force. 
Small parallelogram ..  «. ws ~—-:1085 
_ Large parallelogram ... «2». 1195 
Magnets forming an angle with the needle of about two or 
three degrees. 
Experiment 31. Directive force. 
Small parallelogram ..  ., «. 1160 
Large parallelogram ..)  .. = «.-—:1:275 
Magnets laid flat on the surface of the needle, and drawn from 
the centre to the ends. _ 
Experiment 32. Directive force. 
Small parallelogram... 4. ee = 1108 
Large parallelogram .. 22 «+ ~=—«1261 
Magnets forming with the needle an ‘angle of two or three de- 
grees, their other extremities being connected by a very soft iron 
wire. 
Experiment 33. Directive force. 
Smalliparallelogram 2.0 6.) ee 1145 
Large parallelogram ., = .. ..«1263 
The iron wire was now removed and the needle magnetised, as 
before, at an angle of about two or three degrees. 
Experiment 34. Directive force. 
Small parallelogram ., «2 «. 1160 
Large parallelogram .... = «. 1278 
I now hardened both needles throughout at a bright red, and 
Pn emer Soars ich 
