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wood, but there are some parts which are made of iron.
The barrel is made of wood, and in it is placed the mixture.
The pump; which is made of brass, is placed in the barrel, and the mixture is pumped out through a hole in the bottom of the barrel.
When it comes out through the barrel it passes through a tube, and is sprayed on, and under the potato stalks.
The two wheels are attached to each side of the barrel.
Those wheels are made of wood, but they are covered by iron on the outside.
The shafts are made of wood, and are about five and a half, or six feet long.