4 entries in Ruler
  
Creators Title Comments & References Source Page Categories
Dai Vernon, Dr. Stanley Jaks, Bill Simon, Martin Gardner, Norman Jensen, Bruce Elliott The Ruler force with ruler with name of cards, ruler is balanced on two fingers and fingers brought together until fingers meet, see also p. 981 for ideas by John Hamilton The Phoenix 201 - 250 (Issue 244) 974
Karrell Fox This Works - As a Rule name of selection on bag of ruler Comedy a la Card 19
H. R. Fisher The Slide Rule Trick spectator does some actions with slide ruler, performer in the end divines the number he started withRelated to The Pallbearers Review Vol. 9-10 (Vol. 9, No. 8) 750
Aldo Colombini Follow the Ruler impressions with a carpenter's ruler, eventually selection is formed The Trapdoor - Volume Three (Issue 52) 956