286 



Kansas Academy of Science. 



of 200 the gradually decreasing value indicates, it would seem 

 quite clearly, the lowering of the centroid by the flexure of the 

 beam under the increasing load. Perhaps the lowering of the val- 

 ues from to 30 may be explained by a straightening out of the 

 stays of the beam, or at least a drawing taut. It is quite likely 

 that, owing to the form of the beam already mentioned, that of a 

 triangle, the knife edges might be drawn slightly out of line with 

 no load on the beam. After this the beam remains straight to 

 about 130 gms. load, when it begins to bend slightly under the in- 

 creased strain. Such an explanation would account for the three 

 parts of the curve which appear rather marked. The data for the 

 curve follow: 



4.92 



4.76 



4.70 



3. Values of Laboratory Weights. — The weights were as fol- 

 lows: 1, 20, 50 and 100 gms.; combinations were also made to 

 give 120, 150 and 170 gms. The headings of the columns explain 

 the data. 



