Bui (53, D:v. Chemis.ry, U S. Dept. Agriculture. 



PLATE IV. 



PiAH Of CROSS HEAO I 



*T Z-Jt 



IMPACT 



TESTING MACHINE 



3IBC CLEVATION 



* 



0= 



J 



FRONT ELEVATION 



SECTIOMAL PLAH A-A 



IMPACT MACHINE. 



