STATE GEOLOGIST. 263 
Size of Particles, in Inches, Nipped by Rolls of Various Diameters Placed 
Various Distances Apart, 
Space between the rolls in inches. 
Diameter of rolls in 
inches. 
0.75 0.625 0.50 0.375 | 0.250 | 0.125 0. 
OOM eae ea ae on mor OMe OG | S25 ele wd flemn alert ien elere 
SOR ee hee ae Se ORs eles 6 | sR (ich a ee ball Ae (pnlion lin | I, Zk 
DO Creer esau s seee storeys Ne Sore tela mainline lenttalcilbees lle Weele (a aimele: Ox 
DANE Mecca ots nuove aieie sss 1A elle Ome O melee ele lOM | sOn96 
PAVE aren aes Gg eer ne Le Sn mle Onn intone lielen2 Oeil OOn WOR O4 RORSO 
Aen gcenicie ce aenitrenvetcln tee ADE lO alee Om minds e OnO OM Onion OnO4 
A as Baths eR ea ee lO SORSS es Ol (om OnO2Ze Onan. 736 
Distance Between Rolls, When Diameter and Size of Particles to be 
Crushed are Known. 
Size of feed in inches. 
Diameter of rolls at ees 
in inches. : 
1.50 Us 1.00 0.75 0.50 0.25 
BY be Reade ease 0.046 te 
30 0.280 0.038 
26 (0.432 | 0.191 
AN aah thn 5 RAT lea ote 0.512 0.270 
7A Dene eta reste ae 0.666 0.424 0.031 
1G) Fes aes ae ee 0)..822 0.580 0.185 
Se a ep a Aaa ae SU a te BAe 0.340 0.101 
Qi rere anc orcs, |tenleos Lis 0.851 )), OU P - Oo.B0t2 | Oey 
material at the proper place. The rolls are of chilled cast iron, the 
lower one, being movable, being held in position by strong springs. 
The upper roll has a greater peripheral speed, being geared in the 
desired ratio. In the construction of this mill the ratios 1:1.5, 1:2, 1:2.5 
and 1:3 are carried out. The capacity of this machine is on the average 
8,200 pounds, or 23 barrels per hour, and it requires from 8 to 12 
horsepower. 
