( 01 ) 



water ; and by this proceeding I hoped to difcover, whether the 

 Northern part or pole (as it is called) of the Magnet would point 

 towards the North. 



Plate XIV. fg. 19, AB C D, reprefents this glafs ; at E F is the 

 piece of Loadllone which I placed in the middle of the glafs, that 

 neither of the extremities might be deprelled in the water more 

 than the other. I then put the glafs into an earthen veflel filled 

 with rain water, and I prefently law the North pole of the Magnet 

 move towai-ds the Northern lide of the veflel ; yet fometimes the 

 glafs and the Magnet in it took a contrary diredion, but which, I 

 think, proceeded from hence, that as I often took the glafs 

 out of the water, I might, in replacing it, put the North Pole 

 of the Magnet higher or lower than it lliould be, and there- 

 fore that it might not imiformly move the glafs in the fame 

 dire(ilion. 



I alfo befpoke fome fmall Heel needles, fuch as are ufed for fea- 

 compalles, and both extremities of thefe, namely, the North 

 and South, were rubbed with a Loadflone by a man who made it 

 his bullnefs to prepare fea-compafles. Thefe needles, I put into 

 glafs tubes, clofed at the ends, and of a fize jvift to float, and putting 

 them into the water, I prefently faw the extremities of the needles 

 tend towards the North and South ; but the leafl; particle of dufl, 

 or breath of air meeting the tubes did, I thought, impede their 

 motion. 



But finding, that by reafon of the length of thefe tubes, the 

 Magnet very diflicultly and llowly exerted its influence on the 

 tubes to move them in the water, I broke the glafs again, and 

 prepared another of fuch a ftiape, that the Magnet might put it in 

 motion more fpeedily : the ends of this glafs I also clofed with a 

 blow-pipe. 



Fig. 20, G H I K L M N O, reprefents this glafs ; the letter P 

 indicates the place where the Loadllone was put , and by heating- 

 one end of this glafs, I bent it in the direction L Af, that its dif- 



M 2 



