Forest Service, U. S. Dept. of Agriculture- Mechanical Pulp. 



PLATE VII. 



FIG. 1.-100 R. P. M. (RUN No. 35.) 



^>^^&^c 7/ - 



^if^l 



FIG. 2.-150 R. P. M. (RUN No. 36.) 



F\v ^ 1 ^-. i V*>e?^T ?r 'A r ^ 



^L.^K:/' i;.; 



NBifieSr'i^^^^r-vtA': \L?1 ^ -^ 5rf '/=X ,.' 



a^Qt^a -, 



FlQ. 3.-200 R. P. M. (RUN No. 37.) 

 COMPARISON OF HEMLOCK PULPS GROUND AT DIFFERENT SPEEDS. 



