XI, A, 4 Witt: Testing of Galvanized Iron 165 



iron dissolved by the acid in case such correction is deemed 

 necessary. 



4. Measurements of the solution velocity of galvanized iron in 

 hydrochloric acid have been made. The results indicate that 

 the system of zinc-iron alloys is very complex. From the solu- 

 tion-velocity time curves, an approximate idea of the uniform- 

 ity and purity of the zinc coating may be obtained. 



5. In investigating the value of various methods for testing 

 galvanized iron, it is necessary to know (a) how much iron 

 is dissolved from the base and (b) whether or not any zinc in 

 the form of zinc-iron alloys remains undissolved. Without these 

 data it is impossible to get the proper basis of comparison. 



