Nothing But the Truth Daughters beware! when mother gets out the lie detector. This marvelous machine of truth can tell just when you are telling the truth and when you are not, by the rising or falling of the blood pressure. Heretofore, the usefulness of this machine has been confined entirely to criminal cases, but according to its inventor, it will become as necessary to the average household as the family album. This picture shows the inventor trying out the machine on Wanda Sibbald.

P. & A. Photo · [ca. February 1924]

[Information from item housing] Lie Detectors