6  x skylights with scuttles protected by steel bars 1200 x 700 mm
6  x skylights with scuttles protected by steel bars 1000 x 700 mm
6  x skylights fitted at superstructure wall with scuttles protected by steel bars 1200  mm
6  x skylights with scuttles protected by steel cover 1200 x 700 mm (after 1941)
6  x skylights with scuttles protected by steel cover 1000 x 700 mm (after 1941)
6  x skylights fitted at superstructure wall with scuttles protected by steel bars 1200 mm (after 1941)
6 x skylights without scuttles 700 x 800 mm
6 x skylights without scuttles 800 x 1000 mm