GROUND-WOOD PULP. 59 
15). In this series the jordan in every case brushed as close as, or 
closer than, when the regular mill stock was being used. 
The ground wood from Alpine fir and Engelmann spruce gave the 
best results from the standpoint of operation on the paper machine. 
All of the sheets in this series exhibited very good strength, while the 
color of those from Alpine fir, amabilis fir, and Engelmann spruce 
compared favorably with that of the spruce standard. So far as the 
paper-making qualities of the pulps are concerned, the 17 tests demon- 
strate that all of the woods used are satisfactory for news-print paper. 
It was suggested by the men operating the paper machines that even 
~ more satisfactory results could have been secured had a lighter sheet 
been run, such as is used for catalogues. Table 58 summarizes the re- 
sults of strength and color tests on the papers manufactured from the 
commercial pulp samples. If the results of the single trial to obtain a 
good color for each experimental sheet are compared with the color 
ratings given in Table 3 for afew actual trade news-print sheets, it 
_ will be seen that the latter vary almost as widely in color as the 
experimental papers. 
TABLE 3.—Color ratings of commercial news-print sheets. 
Red. | Green. | Blue.| Black. Red.| Green. | Blue.| Black. 
LN SER Sees a ea 61 59 54 AD RG aes Gd! ea be 66 61 59 114 
1B) SONAL ROR a 61 67 50 DUR AMI IP Dee ne Rec eae Speen See 68 60 58 114 
Ch SENS Sei RAGES fe De 66 62 59 Ue NM WR oo a tS US 71 61 59 109 
1D) LR ep iy TGS jae eR Rae a 61 59 54 DG INOS Seem tes eee ca Coe ah Ld 58 56 56 130 
1) Cer a 69 65 60 TOGHIMON Titus G Jahs vet 65 58 57 120 
Tae OO neh eee Re 70 66 54 TS KOy Wud Soo e Ae eee oe eat Ree 56 55 55 134 
“OF SR AC SANE REAR Nae a 61 59 54 TALS) ATTN QAP is ae TeaOY Bey 61 59 58 122 
TSC Seat in EVR Rae a 69 61 59 1 Uy TR eee a ea 69 57 57 117 
eet eer aye Mie eed - 60 54 54 VS SON AI! SIE ie aE ARC MR ch 64 54 54 120 
YS EEO ee See 65 59 59 116 
TESTS ON NEWSPAPER PRESSES. 
The final test of news-print paper is, of course, its behavior on the 
presses and the way it takes nk. Defects which are not apparent 
when the material is run over the machine become very evident 
when the paper is run through a high-speed press. Under such 
conditions, holes, calender cuts, and the like cause the paper to 
break. | 
The first 12 experimental papers were tested on the presses of the 
St. Louis Republic, St. Louis, Mo. They were run on two duplicate 
machines of the Hoe sextuple rotary type. Some of the rolls of 
experimental paper were 67 inches wide, others were 504 inches, and 
still others 334 inches wide. One entire city edition and a portion 
of another were printed on the experimental papers. 
On one press the papers were run at the rate of 369 copies per 
-minute, and on the other at the rate of 372 per minute, or 22,150 and 
22,300 copies per hour, respectively. This corresponds to a speed of 
paper through the press of approximately 760 feet per minute. 
