Table lamps are a versatile style, produced in a wide variety of sizes, shapes and materials. Periods include Colonial, Victorian, Art Deco, Art Nouveau, Mid Century and traditional. Shapes range from candlestick, ginger jar, vase, column, figural, goose-neck. The majority of these lamps use Harp Lamp Shades.
Harp Lamp Shades have a simple washer/ring fitter. Built of a wire frame these harp lamp shades have a three-wire spider, near the top of the shade with a center ring washer. To place shade onto lamp, simply slip center washer down onto harp, 1/8 IP pipe or cluster stem. Secure with a lamp finial.
These are generalizations.........it is always best to let your personal taste be the guiding influence.
Achieving a sense of balance and harmony between table lampshade and lamp base will present the best appearance Lamp shade proportions should reflect lamp base proportions. Lamps come in a variety of shapes and sizes which may require different guidelines
Lamp shade should cover lamp-socket but not base of lamp
Harp shades fit onto 1/8 IP lamp pipe, clusters and harps.
The advantage of lamp harps is ease of changing heights. If the shade is sitting to low on the lamp base – use a taller harp, likewise if the shade is to short on the lamp base use a shorter harp.
Typically the surface, the lamp is placed on, the shorter the harp used.