Glass Delivery Tube: Cut and Bent over a Broad Flame (Frary, 1914)

A delivery tube is just glass tube cut square and bent to lead gas or vapour where it is wanted. A single clean scratch and a pull give a square break; a broad flame and a turning tube give an even bend that does not kink. Result: a bent glass delivery tube for gas generators, stills and similar apparatus. Source: F. C. Frary, C. S. Taylor and J. D. Edwards, Laboratory Manual of Glass-Blowing (1914), pp. 7-9. Unknown: the tube's shape and size, which depend on the apparatus. Picture: a drawn diagram.