Stretch the sheet of bubble wrap and press it against the window pane. Start at the top and mark off the location of the top ...

Most established window-repair shops specialize in tuning up or replicating double-hung windows, many with the old rope, pulley and weight system (spring-loaded balancers appeared in the late 1920s).

The window is just back from a year-long restoration in New York, where more than a century of dirt was removed. Tiffany glass already costs a lot, and the price tag to restore this one window was ...