ARC BREAK NEEDLE
  1. a “floating needle” occurring above 3.0 or below 2.0 on a calibrated Mark V E-meter with the pc on two cans. An ARC break needle can occur between 2.0 and 3.0 where bad indicators are apparent. (HCOB 21 Oct 68)
  2. An F/N with bad indicators is an ARC break needle. These include propitiation. It is quite usual that a pc has just mentioned grief when the ARC break needle turns on, or some gloomy idea. A real F/N means the pc is out the top; an ARC break needle means he’s out the bottom. He ceases to mock up, through grief. (HCOB 5 Oct 68)
  3. may be dirty, stuck or sticky, but may also give the appearance of floating. The pc will be upset and out of comm at the same time. (HCOB 21 Sept 66)


Technical Dictionary