i6o 



Cdiiiididii I'orcstry Juiiniiil. .If^ril, I(j20. 



p.-ipcr is c.'irricd automatically from 

 one end to the other. 



A Marvelous Machine. 



The wire part of the pa])er machine 

 is the most important and the wire 

 cloth is the most expensive item of 

 supply, costing as much as $800 or 

 $900 for 160" machines, and lasting 

 from three days to three weeks. 



As the stuff flows out on the end- 

 less wire it contains about one part 

 of fibre and 200 parts of water. IL 

 flows out on the moving wire at near- 

 ly the same rate as the latter travels. 

 No sooner does the fluid spread out 

 on the wire than the water starts to 

 go through. Before this has proceed- 

 ed verv far, however, the fil)res, in 







>ettling, have had a chance to inter- 

 weave. The fabric is not of uniform 

 strength in both directioss, because 

 the fibres have a tendency to lie in 

 the direction the stream is flowing, 

 therefore the paper is weaker across 

 the; machine than parallel to the di- 

 rection of flow. Ilence the paper 

 tears more easily one way than the 

 other. In slower running machines 

 it is possible to make a paper of near- 

 ly the same strength in both direc- 

 tions. 



Due to the speed of the machine 

 and the limited length of the wire, 

 only a portion of the water can drain 

 through. An additional amount is 

 drawn oul l)y suction. ap]ilied through 



THE SAW DECK OF A 



PULP MILL. 

 Full length logs are seen 

 coming through the doorway, 

 and as they are carried for- 

 ward by chain conveyors, are 

 cut by the gang of saws into 

 the required lengths, which 

 rr.ay be 24, 32 or 48 inches. 

 In the foreground is a man 

 sharpening one of the huge 

 saws with an electrically 

 driven emery wheel. From this 

 point blocks are conveyed to 

 the block pile for storage, or 

 may first be sent through the 

 barking c-epartment. 



This is a picture of 

 the grinder room of a l?r_ 

 mill making mechani- 

 cal pulp. The wood is 

 seen floating to the 

 grinders and in each 

 of the second and 

 third grinders in the 

 first row a pocket is 

 opened ready for wood 

 to be charged The 



door is then closed 

 and water pressure 

 forces - piston down 

 against the wood, 



which is thus held 

 firmly against the ro- 

 tating stone, the lower 



edge of which is seen on the second stone. Ur.der this 

 are ground off the log by the stone and washed from the stone by a stream of water. 



pit to catch the fibres as they 



