22 GRAVITATION. 



raising it from the earth. All this is effected 

 by putting a piece of lead inside the lower 

 part of the image, and making the base of large 

 curvature, and there you have the whole secret. 

 But what will happen if I try to make the 

 figure stand upon a sharp point? You observe 

 I must get that point exactly under the centre 



Fig. 7. 



of gravity or it will fall over thus [endeavouring 

 unsuccessfully to balance it]; and this you see 

 is a difficult matter, I cannot make it stand 

 steadily; but if I embarrass this poor old lady 



