. Electric railway journal . unt of care in rail manufacture,especially in finishing the rail. Mr. Peterson also referredto the studies on the subject conducted by Messrs. Fell, ofLondon, and Perroud, of Paris, both of whom were quotedas saying that rails in general have a rough or slightly cor-rugated surface immediately after leaving the mill. Fig. 1 shows an apparatus designed by Mr. Peterson tomeasure the smoothness of the surface of the head of arail. With it the corrugations of two adjoining rails in atrack, welded at the joints, were measured, and it was foundthat while each rail was co
. Electric railway journal . unt of care in rail manufacture,especially in finishing the rail. Mr. Peterson also referredto the studies on the subject conducted by Messrs. Fell, ofLondon, and Perroud, of Paris, both of whom were quotedas saying that rails in general have a rough or slightly cor-rugated surface immediately after leaving the mill. Fig. 1 shows an apparatus designed by Mr. Peterson tomeasure the smoothness of the surface of the head of arail. With it the corrugations of two adjoining rails in atrack, welded at the joints, were measured, and it was foundthat while each rail was corrugated, the corrugations wereof different lengths and depths, showing that the directionof movement of the cars did not influence the formationof the waves. Mr. Peterson then took several rails at ran-dom from an electric railway track in process of construc-tion and had their heads slightly planed. They were thenmeasured by the apparatus and found to contain a seriesof slight but very characteristic corrugations, although. Fig. 1—Rail Corrugation—Apparatus for Measuring Waves none of the rails had been in contact with a car rails had a tensile strength of 75 kg per squaremillimeter, with an elongation of 10 per cent. It wasfound, moreover, that at the rail ends which had last leftthe rolls in the mills the corrugations were much shorterand more marked than at the other end of the rails. These *Scc Street Railway Journal for November o. 1907, paRC Klcctric Railway Journal for November 7, 1908, page 1323- rails are shown in Figs. 2 and 3, and the white spots indi-cate the crests of the corrugations. A nick was made onthe lips of the rails directly opposite each crest, and theywere put in service. The period which has since elapsedwas too short to permit Mr. Peterson to draw conclusionswhich were absolutely definite, but it was apparent thatcorrugations were in process of being formed at the pointswhich he had previously marked. Mr. Peterson then discus
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