http://www.practicearchitecture.co.uk/files/gimgs/16_practice-architecture-the-new-gallery-window-types.jpg
glazing layouts
http://www.practicearchitecture.co.uk/files/gimgs/16_practice-architecture-the-new-gallery-windows---back-elevation.jpg
sash window internal elevation
http://www.practicearchitecture.co.uk/files/gimgs/16_practice-architecture-the-new-gallery-elevation.jpg
external elevation
http://www.practicearchitecture.co.uk/files/gimgs/16_practice-architecture-the-new-gallery-sash-mechanism-1-1.jpg
detail of sash mechanism