Go down to the Tesla coil chamber (2nd floor of the tower). Pull the switch down to charge the coil and pull it back up when the needle in the display is still in the light red area (but close to the dark red area). Head back to the control panel on the third floor. Turn the three left switches to the left and see the results. This set of actions is needed to save your daughter. You then leave the castle and live long and happy. There is also another ending to this story. If you pull up the switch in the Tesla coil chamber on the 2nd floor when the needle is in the dark red area, and then pull the three left switches to the left, your daughter will come to life but dies eventually again. You will then be emprisoned again by Dr. Frankenstein and won't live long and happily.
Quelle: weheartit.com mehr