50 



remained intact at the ends of the slali. Tlie king continued supjjort of tlie slab 

 at the extremities alone had caused it to sag to sucii an extent as to be quite no- 

 ticeable even to the casual observer. 



Recently T revisited the place to determine exactly the amount of Hexure 

 which tlic shib had undergone. I found it liad been broken into five or six pieces 

 by vandals. ( )u one of the pieces, which had formed a portion of one side of the 

 slab mar tiie niithlle, I measured carefully the amount of flexure. This piece 

 measured two feet eight and one-half inches along the original edge of the slab. 

 Tlie flexure along this direction was one-tenth of an inch. Tiie dimensions of 

 the original slab were: Length, six feet one inch ; breadth, two feet; and thick- 

 ness, one and four-fifths inches. The measurement of the fragment will not per- 

 mit of an exact estimate of the amount of flexure in the original slab, but would 

 seem to indicate a flexui'e of not less than a quarter of an inch, and possibly 

 more. The slab bears the name of Sarah Mullikin, and gives the year 1847 as the 

 date of her death. I ascertained that the stone had been put in position shortly 

 after this date. The flexure cou'd not have begun, however, until the decay of 

 the middle portion of the supporting wall had made considerable progress. This 

 we may presume to have been not less than ten years after its construction. If 

 we su[)[)ose the gradual bending to have been in progress since 1858, about ten 

 years after the stone was put in position, then we have a flexure of about one- 

 fourth of an inch in a slab one and four-fifths inches thick, produced by the 

 stress of the stone's own weight, acting through a jjcriod of tliirty-seven years. 



The Alternate-Current Transformer With Condenser in One or Both 

 Circuits. By Thomas Cray. 



Elastic Fatigue of Wires. By C. Leo Mees. 



A ^Vari'ei) Surface of Universal Elliptic Eccentricity. By C. A. Waldo. 



.\ccurate Measurements of Surface Tension. By A. I-. Foley. 



Effect of the Caseous Medium on the Electrochemical Equivalent of 

 Me'ials. By C. Leo Mees. 



