Any wooden window frame with a single glass is easy to turn into a double, having received a kind of glazing is not worse than common now brand.
This will require a brace or composite rod-the glass bead and a slightly larger format than is setup in the window so that you can lay on the frame and press with rail, bothering and seal with a rubber strip or putty.
Recommend to read
THE THERMOSTAT-THE CELLAR
Five years ago one of my friends purchased a garage with a cellar and worried about how and what to do to potatoes and other vegetables, planted for winter storage in the cellar, didn't...
DINGHY FOR TOURISTS
"Eureka" is the Dinghy to the simplified construction, designed for home fabrication technology. The hull of the Dinghy — wooden, lightweight, with the lining membrane type. It consists...