ON THE FLEXURE OF WAX, &C. J79 



and the other half con fiderably thicker. It did not appear to rife 

 from the flab ; but was taken up while quite warm and held with 

 its edge downwards, to prevent any flexure from its weight. 

 The thin part immediately began to bend, and the thick part 

 foon afterwards, the flexures being concave on the fide which had 

 touched thejlone, and the verfed fine or height of the curvature 

 was one inch at the end of half a minute, after which it gra- 

 dually ftraightened itfelf as follows, 



Bar of Fufible Metal 1 3 Inches long. 



At 8 h 5 J m taken up flrait. inch. 



5 if it became bended ; verfed fine 1.00 



54 - - lefs bended - do. - 0.7 



55 - - 0.4? 



57 - 0.25 



60 thin part flrait; thick a little curved. 



Another experiment had been made before, without any 

 expe&ation of fuch or fo great a flexure, and no meafures were 

 then taken. In this the bar was thinner and the flexure 

 greater ; and the return to ftraitnefs was not only complete, 

 but one end which was very thin became at laft bended the 

 contrary way, namely the face that had touched the flone was 

 convex. 



A fmaller piece of two inches in length which was not 

 taken up fo foon, had become bended as it lay ; fo that it 

 refted on its two extremities and was hollow in the middle. 

 This .recovered its firft ftraitnefs as it lay on the table. 



I am 



S I R, 



your obliged reader, 



R. B. 



N 2 IX, A 



