Placing the mould as in Figure 7, the lead is poured in the four
openings until the metal projects slightly above the top.
To pour properly first skim the dross as previously explained, then with
the ladle, push the film of oxide away and dip into the clean pure lead.
Pour steadily until the mould is filled and the metal projects slightly
above the top. As it cools there will be quite a little contraction
which takes up most of the excess lead.
[Illustration: Figure 7]
=Never=, under any conditions, stop pouring with a mould partially
filled. Always be sure there is enough melted lead in the ladle to
completely fill the mould, before starting to pour.
The mould can now be easily opened by pulling on the handles especially
if it has been properly dusted with the Ambu Mould Compound.
After the mould is opened, Figure 8, the castings are easily removed,
without damage to either the mould or the casting proper. The workman
does not, at any time, handle the hot parts of the mould or the hot
castings.
[Illustration: Figure 8]
The mould weighs 25 pounds, and is large enough to absorb sufficient
heat to allow continuous pouring without becoming overheated. It is
solid enough to be used without the need of a vise.