MECHANICAL PANELS.
To make a double mechanical panel, that will open and close alternately, follow the device shown in the below diagram.
Cover the faces of the panels, or “doors” with cloth or puffing, and arrange them so as to cover two alcoves on opposite sides of the window. One cord is wound around the barrel and the other is unwound. When the barrel is turned, either by hand or by a motor, one door is raised while the other drops of its own weight, the doors being balanced by each other. The motion is reversed by reversing the barrel, or cylinder.
