and form for a compass needle. 123 
of about 45 degrees, and carried, as before, from the centre 
to the ends of the needle. 
Experiment 29. 
• 
Directive 
force. 
Small parallelogram 
Large parallelogram - 
IO7O 
1170 
The magnets forming with the needle an angle of about 
20 degrees. 
Experiment 30. 
Directive 
force. 
Small parallelogram 
Large parallelogram - 
1085 
1*95 
Magnets forming an angle with the needle of about two 
or three degrees. 
Experiment 31. 
Directive 
force. 
Small parallelogram 
Large parallelogram 
1 l6o 
1275 
Magnets laid flat on the surface of the needle, and drawn 
from the centre to the ends. 
