Sash windows have been around since about the seventieth century or thereabouts. A pulley system inside the frame itself is the mechanism by which the parts of the window can be moved. They slide one over the other instead of opening outwards or inwards. The earliest designs moved sideways instead of the vertical manner is more usually seen today. They were popular because the lines of a house were not disrupted when they were opened.
How to replace a sash cord is a lot easier when you understand the mechanics of a double hung window. Every double hung window has two sashes, the top and the bottom. The frame that secures the glass is a sash. The sides of that frame are the jambs. Sash weights sit in back of the jambs. They are connected to a cord pulley system. The weights keep the windows balanced and easy to open.
After you have lived in a home for quite some time, it is obvious that you tend to accumulate more things. After a while you might find that you have acquired so many different items that you are either going to have to sell a lot of your stuff just to have room. Another option that you have is go out and get yourself one of the many different types of DIY metal buildings.
The history of sash windows is interesting and covers a large period of our civilization. Also called the hung sash window it is made of one or more movable panels, also called sashes. It is an excellent window for ventilation with the panels controlled by pulleys, springs and balances, which direct the movement of the windows. Many Georgian and Victorian houses used these types of windows.