256 



/}/•/./. sy.si EM rr.cHxiCAL jovrnai. 



Pom; R \( ks 



For supporting the poles standing in the treating tanks, it is neces- 

 sary to have a very strong rack siirroinuiing each of the tanks. Fig. 20 

 shows a \ie\v at (mc- end and the front side nf tiie two-tank rack in 

 the \asliville jilant. i'lie poles shown, >tand <S'2 feet heinw iIk' 

 ground level. They are supported at the ends and middle of the 

 rack by timbers under the rack platform at a height of 12 feet abo\e 



iIk- ijniund. .\l the i).ick, liic poles are siipp:)rled 1)\ ,i linihcr w hi<li 

 i> Hi feel alin\c liic i;r(iiin(l. This arrangement prrniils llir treal- 

 iiH'iit ni any size- of |)i)le iij) to and including (>") tcil in Iciiglh. 



It will be noted in Fig. 23, which shows the rack al)()\e one lank, 

 that the |)oles in each lank are di\ide(l at the middk' l)\' the platform 

 of the pole rack. This feaiiirc nf ilu rack has prmcd id in' \er\- 

 desirable in that it j)ermils liie plalforni ni.iii to rcacii an\ |)i)le in 

 the rack during the loading and imloading process, so thai ilure is 

 no delay and no ha/artl in attaching the winch line sling lo, or de- 

 taching it from the poles. The taper of the poles is such that ample 

 space is pro\ itletl for holding ihe sections of the poles at the platform 



