C ;i> ) 
and in North Latitude the End newly placed upward 
becomes the North Pole, though it was a South one 
immediately before, and the other End the South Pole, 
though it was its North one juft before. The Cafe is 
the fame, if fuch a Bar is placed horizontally in or 
near the magnetical Meridian j for the Enddireded to- 
ward the North will conftantly be a South Pole, and 
that which is direded toward the South, a North one; 
and fo foon as ever the Ends of the Bar are fhifted, 
the Polarity, in refped of the Bar, is (hifted 
alfo (but not in refped of the Earth) for which Rea- 
fon this Vertue is called Tranfient, and is communica- 
ted by the Earth’s central Magnet in fuch Manner as 
other Loadftones are faid to do. Page 309//?, Prop. 
\ 6 th. 
XIX. Since in North Latitude the North Pole of 
the Earth’s central Magnet not only gives the Vertue 
of a South Pole to that End of a Bar which is neareft 
to it, but alfo helps it to lift Iron when neither the 
Bar nor Iron lifted has any permanent Vertue the 
faid Magnet muft therefore necelTarily help the South 
Pole of any Loadftone or Touched Steel in lifting Iron, 
but hinder its North Pole. This agrees with common 
Experience, the North Pole of a Magnet being unable 
to lift fo much as its South one in North Latitude, but 
more in South Latitude. 
XX. The preceding plainly fhews the Reafon why 
an armed Magnet, when both of its Poles are applied 
to a Piece of Iron, will lift feveral times fo much as 
with either Pole Angle. For the North Pole of the 
Magnet, by fending its Vertue through the attraded 
Iron, powerfully helps the South Pole of the faid Mag- 
net in attrading. Again, the ftrengthened South Pole 
U u muft 
