This span roof frame is one of the most popular. The sashes are held open at any angle required. These frames are best suited to remain where placed permanently.
Nicholson, George The Illustrated Dictionary of Gardening, Div. VI (London, England: L. Upcott Gill, 1884)
2400×1583, 1.0 MiB
1024×675, 195.3 KiB
640×422, 91.8 KiB
320×211, 25.4 KiB