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 mability 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. 
x | 8 ha, | 2 B 
ce 4 ° n 
: Be ee an es | 8, | a2 | % 
= +3 = Q os Se o3 i) 
= che ws 3 =) a: So 2 I 
=| a = An S = nS rei a 
P es 3S oo = B Cie os 3g S Remarks. 
oO 3 te Oo Con cy Q, jon a a0 i 
Z » q ~ eo oa + &p += ® 
iv q ay a= a q as Aes aS Q 
S) aay ® n 2p Ace ga OP By P=) =| 
Lt n C») >) os) C) ® 
& ©, 3 fo) L =) Q, =) 
uf lea (PO Sto ilies ales Z = = Z 
Lbs. | Lbs. | Lbs. | Lbs. Lbs. Lbs. Lbs. 
6 | 1,015 50 2} 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 Brake due to bad winding. 
4} 1,494 60 23 | 25.0 | 1,386 12,660 | 109.47 | 29.85 8 Breaks we to calender cut (and 
oles 
2 | 1,567 53 16 | 18.0 | 1,480 135 LON LOPS OSH Pe 2OR4l pone Run good. 
8 | 1,513 Aq ea saa se 20.0 | 1,449 11,890 } 121.86] 33.22 )..--.- * Do: 
7 | 1,516 43 16 | 18.0 | 1,439 12,030 | 119.61 S250) eae Do. 
5 | 1,425 56 21 | 22.0 | 1,326 11,850 | 111.89 | 30.49 6 | Breaks due to calender cuts. 
11} 15321 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—501-INCH ROLLS. 
1} 1,046 44 10 | 12.0 980 11,600 | 112.64] 30.71 8 | Breaks due to bad winding. 
1] 1,191 BB! eens 6.0 | 1,152 13,580 | 113.10] 30.84 3 | 2 breaks from scum spots, 1 
from mill paster. 
3 927 32 25 | 7.0 863 9,920 | 115.99 | 31.62 14] 11 duste calender cuts, 3 to bad 
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 il ai fae Sle 15.0 | 1,088 12,270 | 118.22 | 32.22 4 Do. 
9} 1,027 SAN eee 9.0. 986 LEVOZO My O 29i WS 2yo Die eee Run good. 
