A. Winslow — Flexibility of Limestone. 



133 



Art. XVI. — An Illustration of the Flexibility of Lime- 

 stone; by. Arthur Winslow. 



The adjoining cut illustrates an interesting case of the flex- 

 ing of a limestone slab under moderate stress, applied for a 

 long time. The slab is of white, crystalline limestone or 

 inferior marble and is one of a number in the State lot of the 

 cemetery of Jefferson City, Missouri. Others are seen there 



fia.4. 



Sketch showiDg deflection of a limestone slab, due to its weight. Scale 1 inch 

 = 2 feet. Stone erected to memory of Tyrrel P. Bruton, Cemetery, Jefferson 

 City, Mo. 



Notes. — The dimensions of the slab are 6 ft. x 3 ft. x 2 in. It was put in 

 place in the year 1866. The measurements were made August, 1890. The de- 

 flections are expressed in inches. 



in the same conditions, though the flexing in these has not pro- 

 ceeded so far. It is probable that, in the one illustrated, the 

 extreme condition, without fracture, has already been reached, 



Am. Jour. Soi. — Third Series, Vol. XLIII, No. 251.— February, 1892. 

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