But also, the plaster mould draws water from the poured slip to compact and form the casting at the mould surface.
12.
With the casting removed, the plaster mould is left to dry out, and cannot be reused until 100 % dry once more.
13.
The original plaster moulds, executed by Flitzer, were ready in 1938 and were sent to the Bruno Bearzi Atelier in Florence for casting.
14.
In addition, the nineteenth-century models inherited from the old owners were added to those of the great collection of plaster moulds of the Foundry.
15.
The elements of the sphere were cast from these plaster moulds by Bearzi using a cire-perdu process from a bronze / zinc high-tin alloy with added lead.
16.
In its development, Pugh carved a core made of wood, covered it with fresh lemon peel to give it a realistic texture, and then cast a plaster mould.
17.
By August 9, the foundations of the bridge set was built, with a plaster mould used to produce fibreglass " skins " for the various prop consoles and walls.
18.
The techniques of jiggering and jollying can be seen as extensions of the potter's wheel : in jiggering, a shaped tool is slowly brought down onto the plastic clay body that has been placed on top of the rotating plaster mould.
