254 



BELL SYSTEM I ECIIMC.IL JOLKSWL 



wood. This causes the oil, in which these surfaces are inimersfd, 

 to be forced into the wood by atmospheric pressure. 



During the treatment, tiie creosote is absorbed b\- the pole to such 

 an e.xtent that as an average, about 95 per cent, of the sapwood in 

 the treated section of the pole is saturated. This requires from 

 2 to 4 gallons of oil per pole, dejiending upon the size and condition 

 of the |)ok' heiii^ irt-aled. 



Assii.MBLY Lav()i:t 



The same general features of design were followed in all the pole 

 treating plant layouts in so far as i)ractical)le. However, the number 



Fig. 12 — \'k-w of Treat iiiK I'.quipmcnt at SyKa Plant 



of the different units ii-ed \\a> xaricd tn |)ni\iilr llii- plant capacities 

 re(|uire(l. 



In designing the i)lants it was found desirable to separate the 

 p<jles into two or three treating tanks in order that the treating gang 

 could be contiiuiotisty emj)loyed in either preparing or handling poles 

 from or to one of the tanks while the treatment would be in progress 

 in other tanks. B>- dividing the tanks it was also possible to use a 

 smaller (juantity of hot creosote, since the hot oil could be used in one 

 tank and when that treatment was fmished, i^timped to another 

 tank containing iresh poles ready for treatment. Cutting down the 

 hot oil capacit\', of course, reduced the amount of radiation in the 

 heating tank and also the amount of radiation in use at any particular 



