The answer to that question is usually very simple. But today, we are stretching the definition. Traditionally, these shades are similar to a cylinder with fairly straight sides. Think of a barrel of oil!
However, today, drum tones take on many variations in shape and design. You will find modified versions that have a relatively narrower top diameter. There are beautiful versions of shapes with graceful curved sides. There are V-shaped notch designs on the top and/or bottom edges. There are shallow drums that are short and stocky in appearance, also called Bouillotte lampshades.
Drum shades are highly functional because they not only diffuse light outward through the screen fabric, but also reflect light back and forth where it can diffuse from the ceiling.
In general, these shades are relatively larger compared to others, allowing for the use of higher wattage bulbs and therefore more light output.
Drum tones were extremely popular from the early 20th century until the 1980s, when they fell out of favor. Today they are becoming extremely popular and are “new again”. Almost every interior design magazine is full of battery displays. You will see that they are used in every room of the house.
Although there are many options, here are some lamps that simply “cry out” for drum shades:
hollywood regency
rigid lamps
ornate metal antique lamps
antique glass lamps
antique porcelain lamps
Capodimonte antique lamps
George and Martha Washington lamps
Antique Lamps Circa 1950 – 1980
New reproduction of all the styles mentioned above and many others
In short, most lamp styles can be used with a drum shade. It very much depends on personal preference and the look you want to achieve with the lamp.
Good luck on your next lampshade project.