The answer to that question use to be very simple. But today, we are stretching the definition. Traditionally these lamp shades are similar to a cylinder with fairly straight sides. Just think of an oil barrel!

However, today drum lamp shades take on many variations of form and design. You will find modified versions which have a relatively narrower top diameter. There are bell shape versions with graceful curving sides. There are V shaped notch designs in the top and/or bottom rims. There are shallow shades which are short and stocky in appearance, also called Bouillotte lamp shades.

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