The experience with Sperry detector cars during 10 years of service in the U.S. is reported. Changes in the design of the car to increase sensitivity and reliability are reported. The rails are pre-energized by a magnetic flux, followed by the magnetic flux from the search unit. The searching unit has four-coils which are staggered rather than in line. The Type 80 modification is described which contains special amplifiers and recording pens to differentiate defects of certain types. During 5 years of experience 40 percent of the defects detected were transverse or compound fissures, 40 percent were vertical split heads, 15 percent were horizontal split heads, and 5 percent were miscellaneous defects. Five hundred miles of fissure-containing rails have been removed during the last 10 years after detection with Sperry detector cars.

  • Corporate Authors:

    Temple Press Limited

    161-166 Fleet Street
    Longon EC4,   England 
  • Publication Date: 1941-8-29

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Filing Info

  • Accession Number: 00037872
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 8 1994 12:00AM