Apparatus for positioning a pipe sample circumferentially by sensing of disturbancesin a null plane between oppositely polarized exciter coils
US3273055A
Constant impedance dual circuits for sample material flaw detection
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Dual channel flaw detector having phase comparison feedback for automatic balancing
US3311818A
Non-contact apparatus for magnetically measuring strain
US3290593A
Meter relay using fiber optics for ease of replacing a lamp and photocell
US3283162A
Photosensitive apparatus for detecting a flaw in material with steady illumination means
US3200302A
Signal programmed time delay
US3271662A
Flaw detecting apparatus having multiple pick-up and exciting coils on the same side of the test piece
US3241058A
Flaw detecting apparatus having null plane positioned sensors which are series connected
US3239756A
Instrument dial printer which prints a particular dial for a particular instrument by reading discrete instrument pointer excursions and printing discrete dial indicial accordingly
US3196321A
Continuous reading meter relay having anti-bounce contact feature
US3241061A
Flaw finding apparatus having capacitive sensors spaced apart along line of movementof a metallic sample while included in a bridge circuit feeding a difference amplifier
US3247453A
Magnetic flaw detector with exciting and sensing coils axially aligned on opposite sides of the material
CA775244A
Method and apparatus for determining hardness of ferromagnetic material
CA757212A
Non-contact apparatus and methods for measuring strain
