This apparatus is used for a limit test for arsenic, as described in European Pharmacopeia, 1997, page 51

Complete consists of 125mL conical flask with a [ST] 24/40 joint, a capillary chimney with a pulled tip below and a [ST] 24/40 joint at bottom, #5 flat-ground joint at top with hooks for 3/4-inch springs, and an adapter tube with #5 flat-ground joint with hooks. Fabricated from borosilicate glass.