. Official proceedings . f pitting. The electrolytic system as applied to locomotives on theChicago and Alton Railroad has thus been proven successfulin inhibiting pitting and corrosion of boiler tubes, sheets andstay bolts. The system commends itself as being of universalapplication irrespective of the character of the water. I have here a piece of a boiler tube removed from a yardengine using one of our worst pitting waters; you will noticethe pitting is very bad. one of the pits having pierced the condition developed in 12 months of service. This otherpiece of tube is in perfect c
. Official proceedings . f pitting. The electrolytic system as applied to locomotives on theChicago and Alton Railroad has thus been proven successfulin inhibiting pitting and corrosion of boiler tubes, sheets andstay bolts. The system commends itself as being of universalapplication irrespective of the character of the water. I have here a piece of a boiler tube removed from a yardengine using one of our worst pitting waters; you will noticethe pitting is very bad. one of the pits having pierced the condition developed in 12 months of service. This otherpiece of tube is in perfect condition, representing a tube thathad seen 18 months service in the same water and in the sameengine after electrodes had been installed. All contemporarypower in these yards continue to develope Hue failures frompitting in less than twelve months. In this locomotive, as inthree others in passenger service in pitting districts, the pittingand grooving of the tubes and the tire box and shell has beendefinitely Section of tube removed from yard engine after 12months service, one of the pieces referred to. The reason for the success of this system over the failureof the Cumberland process to give protection from pitting. Iattribute to the electrolytic polarization of the galvanic coupleswhich cause pits. This is accomplished by plating out thearsenic to act as a secondary cathode. The function of thearsenic is to prevent the iron from displacing hydrogen fromsolution without which no pitting can take place. The cur-rent also causes a dense coating of calcite over the surface ofthe flue which also protects the tube to a great extent. The 140 one outstanding fact therefore that is worthy of your investiga-tion is this, that the electrolytic polarization system of pittingprevention as installed and operated on the Chicago and AltonRailroad has stopped pitting and corrosion in boilers soequipped. PRESIDENT: We have with us a gentleman whoseduties carry him throughout the
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