20 BULLETIN" 404, U. S. DEPARTMENT OF AGEICULTUEE. 



show any appreciable improvement when dmnped from the rotary. 

 Stock from cooks Nos. 310, 311, and 312 was given a medium brush 

 and washing of one hour, bleached with 10.95 per cent of bleach, 

 made into a furnish consisting of 15.2 per cent of sulphite and 84.8 

 per cent of hurd stock, loaded with 15.2 per cent of clay, sized with 

 1.28 per cent of resiQ size, given a medium, brush for one hour, tinted, 

 and pumped to the stock chest. Stock from cooks Nos. 313 and 314 

 was treated in exactly the same manner, except that 11.4 per cent 

 of bleach was used. It was pumped to the stock chest and mixed 

 with the furnished stock from cooks Nos. 310, 311, and 312. A 

 medium Jordan brush was given the stock and it acted well on the 

 paper machine, which was speeded to 75 feet per minute. There 

 seems to be a tendency in the hurd. stock to crush a little at the 

 "dandy roll," and although the marks are not removed by the calen- 

 der stack which was employed in those tests it was found that one 

 "nip" on the supercalenders renders them practically imperceptible 

 and it is believed that the proper size and weight of calender stack 

 would entirely remove these marks. All of the papers produced 

 up to this point are somewhat lacking in the bulk desired in a book 

 paper; therefore, in the two following runs soda-poplar stock was 

 included in the furnishes. 



In run No. 143 stock from cooks Nos. 315 and 316 was given a 

 medium brush and washing for one hour and was medium brushed 

 for one hour more, bleached with 11.3 per cent of bleach assisted 

 with one-half pint of oH of vitriol, made into a furnish of 16.5 per 

 cent of sulphite, 22.3 per cent of soda poplar, and 61.2 per cent of 

 hurd stock, loaded with 22 per cent of clay, sized with 1.38 per cent 

 of resin size, given a hard brush for one hour, tinted very strongly, 

 and piunped to the stock chest. This stock was beaten to a greater 

 extent than in previous runs. The stock was run on the paper 

 machine at a speed of 75 feet per minute, using a medium Jordan 

 brush, and no trouble whatsoever was experienced. Not over 2 

 pounds of "broke" was produced during the whole run, and that 

 was in the "threading" of the machine. The color of the sheet is 

 entirely satisfactory for many uses. The wood shives apparently 

 were reduced to a satisfactory degree. Experienced paper makers 

 commented very favorably on the running of this furnish and the 

 quality of the paper produced. 



Run No. 144 was intended as a duplicate of run No. 143. Stock 

 from cooks Nos. 317 and 318 was given a medium brush and washing 

 for one hour and a further medium brush of one hour, bleached with 

 11.4 per cent of bleach, and made into a furnish composed of 15.5 

 per cent of sulphite, 23.5 per cent of soda poplar, and 61 per cent of 

 hurd stock, loaded with 21.4 per cent of clay, sized with 1.17 per cent 

 of resin size, hard brushed for one hour, tinted by th,e expert colorer 



