Measure across the shade's bottom diameter to determine the appropriate size.
Common type of lamps which take student shades originated in
the kerosene-burning era of the late 1800's. Single-standing
brass and glass oil lamps with central draft oil burners and student lamps were designed to eliminate
shadows and push the light downwards for studying. The popularity of these lamps
continued well into the advent of electricity and are even today still produced
in a variety of styles.