XIII

FINGER BOWL, CRUMB TRAY, TEA CADDY, VASE, BELL AND BRACKET, DRAWER

PULLS, ETC.

_Brass:_ Brass is an alloy of copper and zinc. The zinc colours the

copper and gives it the yellowish or brassy look, depending upon the

amount of zinc melted with it. While the operations are the same

whether you are working with brass, copper, or silver, the presence of

the zinc in brass makes it less pliable than the pure metals. That is

why brass hardens so quickly under hammering, making it necessary to

anneal the metal very often in order to work it. But zinc and copper

combined melt at a lower temperature than copper or silver pure, so

that great care must be taken when preparing the metal for soldering or

annealing that you do not heat it over a dull red heat before plunging

it into water.

The Library of Work and Play: Working in Metals · 第 112 / 234 题