GROUND-WOOD WW. 



57 



quick-cook sulphite and 80 per cent of ground wood. The complete 



list of material furnished the beaters is given in Tabic 2. 



The quantities of the different colors added varied with the color 

 of the pulp. In every case attempt was made to duplicate the 

 standard news color used by the company manufacturing the paper. 

 It is very probable that if the sheets had been left uncolored, or had 



Fig. 44. — Black gum (Nyssa sylvatica). 



been colored a cream white, they would have presented a better 

 appearance than they did. 



Of the first series of 12 tests, those on white spruce, balsam fir, and 

 Sitka spruce were run on a Fourdrinier paper machine trimming 109 

 inches wide and having a jacketed upper couch roll. On account of 

 the slowness of the stock and insufficient suction the operation of the 

 pulps in these three tests was somewhat unsatisfactory. There was 

 sticking of the pulp to the couch and difficulty in securing good forma- 

 tion. 



