392 



REIBLING AND REYES. 



Table VIII. — Sounchiess 



6 



"3. 

 B 



a 



a • 

 -1.2 



oi 



H 



« 



Nature of 

 sample. 



Fineness. 



Classifi- 

 cation 



by 

 White. 



Microscopic examination (duplicate 

 samples, Bureau of Science). 



Micro- 

 scopic. 



si 



gg 



g ID 



■« a 



1 



D 



Average sample 

 taken from 1 

 barrel of ce- 

 ment. 



Medium 



80.2 



94.8 



Poor__ 



An almost immediate formation of 

 a mass of long needles (single, 

 clusters, and rosettes). Little 

 additional formation after 5 min- 

 utes. No plumes appear in 1 

 hour. 



2 



G 



do 



do 



77.4 



93.0 



...do.. 



An almost immediate formation of 

 many rosettes of needles. Little 





















change after 5 minutes. No 

















plumes appear in 1 hour. 



3 



H 



do 



Fine 



88.4 



97.2 



Pass- 

 able. 



A fair amount of well-defined long 

 needles and rosettes. Little 

 changes after 5 minutes. One 

 feathery crystal appears in 1 hour. 



4 



K 



Average mixture 

 of many sam- 

 ples taken from 

 different bar- 

 rels. (A quick- 

 setting cement.) 



...do .... 



89.0 



99.0 



___do._ 



A few defined rosettes and short 

 and long needles. No plumes or 

 feathers in 1 hour. Short, 

 stubby rosettes of needles develop 

 after 5 minutes. Slides show very 

 little free lime. 



5 



M 



Average sample 

 taken from 1 

 barrel of ce- 

 ment. 



Medium 



79.8 



94.8 



Poor__ 



An almost immediate formation of 

 a mass of well-defined long and 

 short rosettes of needles. Needles 

 continued to grow in number until 

 slide presents almost a white ap- 

 pearance. No plumes in 1 hour. 



6 



N 



do 



Rather 



76.4 



95.6 



do — 



Long needle and somewhat feathery 









coarse. 









short needles. Little change after 

 5 minutes. No plumes in 1 hour. 



7 







Average mixture 

 of many sam- 

 ples taken from 

 different bar- 

 rels. 



Medium 



78.0 



96.0 



...do.. 



Long needles and somewhat feath- 

 ery short rosettes of needles. A 

 greater quantity after 15 minutes. 

 Two plumes form in 1 hour. 



8 







Average sample 

 taken from 1 

 barrel of ce- 

 ment. 



Fine 



87.4 



97.8 



...do— 



A great mass of rosettes of needles 

 (more than any of the above) and 

 short. No plumes. 



9 







Unaerated 

 ground rotary 

 cement receiv- 

 ed from cement 

 factory. 



Coarse.. 



74.8 



88. 8J 



Bad .. 



An almost immediate formation of 

 rosettes of needles and plumes in 

 numbers. Radiating needles bor- 

 der some feathery petals. 



