tig. 1. 



k 



• ■■ 



i 



■■IX* 



;iPi l,lv: xt 



!!ii|||p!!j!i Ba. 



Iiilifiiiiiifiii!i 



TV? 'iPIl 



A 



■ 



3? 



Hg 



H!,|,| T , 



Figure 53. — Sellers pulp dresser, 1832. To remove "knots" 

 (globular inclusions in the dilute pulp) the turning rotor was 

 immersed in the stuff chest as indicated by dotted line. 

 Acceptable pulp passed through parallel bar grids on surfaces 

 (a) and was supplied to the paper machine through hub 

 opening (e). From Journal of The Franklin Institute (December 

 1832), new ser., vol. 10. 



acting guillotine paper cutter in use in England, 

 when in America they had almost entirely super- 

 seded the plane or bookbinder's trimmer for all paper 

 trimmed and put up at the mills. 



He understood there were very serious objections 

 to them, inasmuch as a chisel-edged knife could not 

 be thrust directly down through paper, without 

 turning or making a sharp edge on the lower side 

 of every sheet. 



Yes, I replied, if the paper is loose, but the pile of 

 paper to be trimmed being pressed tightly together, 

 the knife goes through it like shaving wood, and 



added, this you can try with a sharp chisel, when you 

 have the paper pressed on a calender roll shaft, ready 

 for the lathe. 



He had never thought of this, but should certainly 

 try it. He then asked if I would, for a consideration, 

 sketch the most approved plan in use. 



I replied that I would cheerfully and freely give 

 him any information he wanted: the machine was 

 patented in the United States, and at that time we 

 were the exclusive builders, paying the patentee a 

 royalty on each machine; that their introduction had 

 been rapid; that in the United States there were 



120 



