Blowtube

noun

1. A hollow iron rod, from 5 to 6 feet long, by blowing through which a glass-blower expands the semi-fluid metal gathered on its further end while shaping it on the marver.
2. Same as blow-gun.
3. A blowgun.
4. A similar instrument, commonly of tin, used by boys for discharging paper wads and other light missiles.
5. A long wrought iron tube, on the end of which the workman gathers a quantity of “metal” (melted glass), and through which he blows to expand or shape it; -- called also blowing tube, and blowpipe.