Benton — Experimental Method in the Flow of Solids. 209 



ing to sunlight. The results obtained in this way are given in 

 figs. 1-7. 



Fig. 1. Framework before flow. Fig. 2. Same framework after flow. 



Figs. 1, 2. The cube was compressed through a distance of ^ in. = 0'79 cm . 

 The faces in contact with the plates extended so as to become squares 1^| in. 

 = 492 cni on a side. 



Fig. 3. Framework after flow. 



Fig. 3. The cube was compressed through -§• in. = l'59 cm . The faces in 

 contact with the plates extended to 2 T 1 g in. = 5 - 24 cm on a side. 



Fig. 4. Framework before flow. Fig. 5. Same framework after flow. 



Figs. 4, 5. The cube was compressed through if in. — 2 , 38 cm . The faces 

 next to the plates extended to 2| in. = G^OS ™ on a side. In Fig. 5, one 

 cross-wire is missing next to the right hand end. 



Fig. 6. Framework before flow. Fig. 7. Same framework after flow. 



Figs. 6, 7. The cube was compressed through 1^ in. = 3'26 cm . The 

 faces next to the plates extended to 2^- in. = O'Sl 01 " on a side. In Fig. 7, 

 the cross-wire at the extreme right hand end became detached during the 

 treatment with H 2 S0 4 , and is missing. 



