ILLUSTRATIONS. 



Page. 

 PLATE I. Fig. 1. Motor generator set and switchboard. Fig. 2. Grinder and 



wet-machine room Frontispiece. 



II. Fig. 1. Natural surface of stone (jack pine run No. 2). Fig. 2. Ten 

 to the inch solid, straight-cut burr (hemlock run No. 0). Fig. 3. 

 Eight to the inch solid, spiral burr (hemlock run No. 43) 8 



III. Fig. 1. Three to the inch solid, straight-cut burr (hemlock run No. 



46). Fig. 2. Three to the inch solid, straight-cut burr, cut over 

 with 12 to the inch solid, spiral burr (hemlock rim No. 51). Fig. 

 3. Six to the inch diamond-point burr (jack pine run No. 17-1) . . 8 



IV. Fig. 1. Spruce sulphite standard. Fig. 2. Spruce ground wood, 



No. 1 standard 16 



V. Fig. 1. Spruce ground wood, No. 2 standard. Fig. 2. Spruce 



ground wood, No. 3 standard, coarse ground 16 



VI. Fig. 1. Spruce ground wood, No. 4 standard, medium ground. 



Fig. 2. Spruce ground wood, No. 5 standard, fine ground 16 



VII. Comparison of hemlock pulps ground at different speeds. Fig. 1. - 

 100 revolutions per minute (run No. 35). Fig. 2. 150 revolutions 

 per minute (run No. 36). Fig. 3. 200 revolutions per minute 



(run No. 37) 16 



VIII. Comparison of jack pine pulps ground at different speeds. Fig. 1. 

 152 revolutions per minute (run No. 19). Fig. 2. 205 revolu- 

 tions per minute (run No. 20-1) 16 



IX. Fig. 1. Jack pine ground wood (run No. 14-1). Fig. 2. Jack pine 



ground wood (run No. 13-1) 16 



X. Fig. 1. Jack pine ground wood (run No. 7-1). Fig. 2. Jack pine 



ground wood (commercial run No. 24) 16 



XI. Fig. 1. Hemlock ground wood (run No. 41). Fig. 2. Hemlock 



ground wood (commercial run No. 14-1) 16 



XII. Fig. 1. Hemlock ground wood (commercial run No. 8). Fig. 2. 



Hemlock ground wood (run No. 2) 16 



XIII. Fig. 1. Hemlock ground wood (commercial run No. 30). Fig. 2. 



Hemlock ground wood (commercial run No. 50). (Used in accom- 

 panying paper sample) 16 



XIV. Fig. 1. Ground-wood pulp, one-third spruce, two-thirds hemlock 



(run No. 46a). Fig. 2. Ground- wood pulp, all hemlock (run No. 



466). Fig. 3. Ground-wood pulp, all spruce (run No. 46c) 16 



XV. Mixed ground- wood pulps (used in accompanying paper samples). 

 Fig. 1. One-third spruce, two-thirds hemlock (commercial run 

 No. 46a). Fig. 2. One-third hemlock, one- third jack pine, one- 

 third spruce (commercial run No. 51). Fig. 3. One-third jack 

 pine, two-thirds hemlock (commercial run No. 52) 16 



TEXT FIGURE. 



FIG. 1. Portion of a chart from a recording wattmeter, showing decreased power 



consumption after removal of load from pocket and pocket binding. . . 14 

 4 



