The pewterers employ a very peculiar modification of the blowpipe, which may be called the hot-air blast, and the names for which apparatus are no less peculiar; a fig. 313, being called the hod, and b, the gentleman. The first is a common cast-iron pot with a close cover, containing ignited charcoal; two nozzles lead into and from it, to allow the passage of a stream of air, through the pipe c, from bellows worked by the foot.