THE YOUNG SCIENTIST. 
41 
In the morning you can put the two 
pieces together, after washing off the clay 
ithat still adheres to them, and keep them 
I in place by winding a strong cord se- 
curely around them; then mix your plas- 
ter, as before, and pour it into the mould, 
a bowl full at a time, and after every bowl 
full you must roll, and turn, and tip the 
mould until the plaster penetrates into 
every part of it ; do this until the plaster 
inside the mould is about three inches 
thick, when nothing more can be done 
that day, as the cast must have time to 
harden, or you will be likely to break it. 
appears. Do not dent the cast with the 
chisel if you can possibly avoid it. If you 
should do so, mix a little fresh plaster and 
fill the dent with it. You must use a small 
chisel to do the fine chipping about the 
face, and be very caref ul not to disfigure 
the features. If you should break any 
Fig. 9. 
The next day you can get out your mal 
let and chisels. 
Plaster workers have a particular kind 
of chisel, like that shown in Fig. 10. If 
you live near a blacksmith, you could 
easily have a large and a small one made ; 
if not, you can make ordinary chisels 
answer. 
With your mallet and largest chisel, be- 
gin at the lower edge of the bust to " chip 
off " the mould. It is delightful to see the 
face you worked so long at in the clay, ap- 
pearing in the plaster, as the mould dis- 
Fig. 10. 
part of it, you can mend it again by mak- 
ing the edges rough, and joining them 
with wet plaster. 
After the mould is all off, place the cast 
where it will dry, and give all your atten- 
tion to the Pedestal to mount it on. You 
can buy one for a trifle at the image- 
caster's, but if you prefer to make one, 
you must proceed in the following man- 
ner. Model in clay one shaped like Fig. 
11, having the circumference of the bot- 
tom about the same as the circumference 
of the head. After it is modelled, give it 
a covering of plaster two inches thick, for 
the mould; then remove the clay, and 
after washing the mould and letting it 
Fig. 11. 
stand a while in water, fill it full of wet 
plaster ; when that is hard, chip off the 
mould as before, and you have your pedes- 
tal. Insert the top of it in the opening in 
the bottom of the bust, be sure that it will 
stand straight, then fill in all around it 
