Pitchers may be used or "tin" cans bent to facilitate
pouring. Before using the slip, however, it should
be slowly poured back and forth from one pitcher
to the other in order to break any of the air bubbles
which are likely to form in newly prepared slip.
Each plaster mold still retains some of the
soap size which must be removed before the mold
can be used. It is therefore cleansed by being
filled with the slip, which is at once emptied out.
It is then allowed to stand for ten minutes in
order that the water may be absorbed from the
clay which has been deposited upon the walls.
This thin lining of clay is now picked out by means
of a small piece of plastic clay, which is pressed
against it. The thin clay coating will readily
adhere to the piece of moist clay. If all of it
cannot be taken out in this way it may be wiped
out with a piece of cloth. After being cleaned




CD



pour plaster
molds full of sUp



p9ur Frea slip b&ck inlo
pitcKor, a wall i" in. tKi,ck-
noss ramaxvn in. mold,
wK\cir\. Kas baon drawn, bo
iixsicU, of plasbar fornrt






£>m\ UTvart&cL
upon, two sticks
to aUow claj^ bo
dru




thA nAwlu cast
bowl wilt drop
down on tabl^
botwaon sticks
wnan dru




showtnci' ncwlij cast
bowl and. section oF
plaster mold



Casttncj a small bowL by maans of a plaster cast



136 ELEMENTARY INDUSTRIAL ARTS

the form should again be allowed to dry out
thoroughly.
