1919 Aug. 68/1 Doc Bowers' Truth Machine was fulfilling its sole function, which was to demonstrate that the subject's blood pressure was above normal.
1964 8 Apr. 6/1 The truth about the truth-machine is that it is as good as—but only as good as—the judgment and interpretation of its operator.
2011 M. S. Sweeney 119/1 If such differences could indeed be demonstrated, a PET scan would function as a truth machine.