Since the dawn of glass lamp shades, glassmiths would create decorative ornate pieces. Perhaps they were commissioned for a specific design or maybe they were making shades for a production of lighting. Either way, one questions remained: fitment. How was this designed shade going to fit on a lamp fixture?
Fortunately some standardized sizes were adopted by the lighting industry and they are still in use today. Traditionally shades were mounted to a fixture with a lipped edge (Figure 2). The shade holder would use a series of set screws (normally 3) to mount the shade to the fixture.
For smaller shades, also known as fixture shades, the fitter size is known as a 2 1/4 Inch Fitter. These shades are common in sconces, pendants, pan lights, bathroom fixtures, floor lamps, and many more applications.
