Wiktionary
banker's lamp
n. A distinctive type of desk lamp, usually with a solid ornate base and a single stem leading to a horizontal (usually green) cover.
Wikipedia
Banker's lamp
The banker's lamp (or Emeralite) is an iconic style of electric table lamp characterised by a brass stand, green glass lamp shade and pull-chain switch (though modern versions may make use of alternate switch types). Other examples feature amber-coloured glass.