60 



BULLETIN 343, U. S. DEPARTMENT OF AGRICULTURE. 



Allowing for breaks and other interruptions, the actual number of 

 papers printed per hour under ordinary conditions ranges from 10,000 

 to 19,000, depending on the quality of the paper used. In the case 

 of the experimental papers none of the ordinary conditions of 

 operation in the pressroom were changed in any particular. A 

 single speed was maintained throughout the tests and the only 

 adjustments made were those necessary to secure a good-looking 

 sheet, such as changing the supply of ink to various portions of the 

 type and adjusting the tension on the paper. Under ordinary 

 conditions of operation in the pressroom of the St. Louis Republic 

 there is one break to each ton (2,000 pounds) of paper run through 

 the press. With the paper ordinarily used, 1,000 eight-page papers 

 weigh 113 pounds. This corresponds to a sheet weighing approxi- 

 mately 31 pounds per ream of 500 sheets, 24 by 36 inches in size. 



From Table 4, which gives the results of the printing tests, it will 

 be seen that in some of the rolls, particularly those of white and Sitka 

 spruce, there were a great many breaks. Almost all of these were 

 due, however, to calender cuts on the edges of the sheets, scum spots, 

 defective mill pasters, and poor winding. In the main, they were 

 the result of inability to secure the best operating conditions on the 

 paper machine before the supply of experimental pulp became 

 exhausted. Difficulty with the spruces led us to believe that with 

 proper operation on the machine practically all the trouble could 

 have been eliminated. 



Table 4 . — Printing-press data — experimental papers. 

 ST. LOUIS REPUBLIC, APR. 29-30, 1913— 67-INCH ROLLS. 











C> 



03 



to 

 w*>. 



00 



>> 









1 







P. 

 P 



03 



CD 

 ft 

 03 . 

 ftm 



ftS 



o 



^ Pi 



•* TO 



O ® 



° P 



1 

 3 



P 







03 

 +3 





03 



PI 



O 



O t-i 



ft 



v, ft 



s CO 



Q,ft 



rr® 



cop 



S3 



O 

 t-t 

 CO 



Remarks. 





P 





A 



p 



P cd 



p is 



p 2 



p 







M 



CO 



CO 





SO 



a a 



■SPPi 



. M m 



n 





o 



02 



£ 



03 



Eh 



o 



hi 



£ 



CD 



fc ft 



£ 



£ 



p 







Lbs. 



Lbs. 



Lbs. 



Lbs. 



Lbs, 





Lbs. 



L6*. 







6 



1,015 



50 



12 



13.5 



939.5 



8,950 



104. 97 



28.64 





Run good. 



10 



1,478 



44 



17 



20.0 



1,397 



13,020 



107. 29 



29.24 



5 



Breaks due to bad winding. 



4 



1,494 



60 



23 



25.0 



1,386 



12, 660 



109. 47 



29.85 



8 



Breaks due to calender cut (and 



holes). 

 Run good. 



2 



1,567 



53 



16 



18.0 



1,480 



13,710 



107. 95 



29.41 





8 



1,513 



44 





20.0 



1,449 



11,890 



121.86 



33.22 





Do. 



7 



1,516 



43 



16 



18.0 



1,439 



12,030 



119.61 



32.61 





Do. 



5 



1,425 



56 



21 



22.0 



1,326 



11,850 



111.89 



30.49 



6 



Breaks due to calender cuts. 



11 



1,321 



41 



82 



19.0 



1,179 



10,220 



115.36 



31.44 



3 



Breaks due to calender cuts 

 (and holes). 



12 



1,473 



44 



11 



19.5 



1,398.5 



11,370 



123.00 



33.56 



1 



Unknown (cuts on end of roll). 



ST. LOUIS REPUBLIC, APR. 29-30, 1913— 50HNCH ROLLS. 



1 



1,046 



44 



10 



12.0 



980 



11,600 



112. 64 



30.71 



8 



Breaks due to bad winding. 



1 



1,191 



33 





6.0 



1,152 



13,580 



113. 10 



30.84 



3 



2 breaks from scum spots, 1 



from mill paster. 

 11 due to calender cuts, 3 to bad 



3 



927 



32 



25 



7.0 



863 



9,920 



115.99 



31.62 



14 























winding. 



3 



873 



45 



6 



7.0 



815 



9,400 



115.60 



31.53 



3 



Due to calender cut and mill 

 paster, cuts, and holes. 



9 



1,134 



31 





15.0 



1,088 



12,270 



118.22 



32.22 



4 



Do. 



9 



1,027 



32 





9.0 



986 



11,020 



119.29 



32.52 





Run good. 



