(under subclass 200) Subject matter which includes means to magnetize a railroad rail to create a test magnetic field in the rail, the apparatus to sense and indicate the sensing of the magnetic field being responsive to the field of the rail to note any change in the indication from the normal known magnetic pattern of the magnetized rail.
(1) Note. The subcombinations of means to magnetize a rail and of means to sense the magnetization of the rail are classified here.
SEE OR SEARCH THIS CLASS, SUBCLASS:
62+, for the resistance testing of rails.
65, particularly for the flaw testing of rails by resistance means.
SEE OR SEARCH CLASS
73, Measuring and Testing,
636+, for the testing of rails for flaws by vibration. 346, Recorders,
33, for a marking device which is responsive to a magnetic rail flaw detection device.
