How to work around not enough slots available in breaker panel
It looks like your old Westinghouse panel will accept breakers from Eaton or Cutler-Hammer (but check at place of purchase).  If so, this tandem breaker can serve two circuits but use only one slot in the panel.


This is different from a double pole breaker which takes two slots like you would need for a 240 volt appliance:


To use the tandem, pull out a pair of single pole/non-tandem breakers (and discard), connect the two circuit wires to the tandem and insert.  Voila!  You have freed up an extra slot.