[1] : Jargon File (4.3.1, 29 Jun 2001)

lace card n. obs. a punched card with all holes punched also
   called a `whoopee card' or `ventilator card'. card readers tended to
   jam when they got to one of these, as the resulting card had too little
   structural strength to avoid buckling inside the mechanism. card punches
   could also jam trying to produce these things owing to power-supply
   problems. when some practical joker fed a lace card through the reader,
   you needed to clear the jam with a `card knife' -- which you used on the
   joker first.


see also:
punched card 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

lace card
     
        obsolete a punched card with all holes punched also
        called a "whoopee card" or "ventilator card".  card readers
        tended to jam when they got to one of these, as the resulting
        card had too little structural strength to avoid buckling
        inside the mechanism.  card punches could also jam trying to
        produce these things owing to power-supply problems.  when
        some practical joker fed a lace card through the reader, you
        needed to clear the jam with a "card knife" - which you used
        on the joker first.
     
        jargon file
     
     
see also:
punched card jargon file 

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