fore, are properties of
centrifugal motion. Cream is the fatty portion of the milk. It is
contained in little globules, and when the milk is allowed to stand, the
milk surrounding the globules, being heavier than the cream, forces its
way to the bottom, and the cream by that means goes to the top. The
inventor has taken advantage of this fact by making a machine which will
take the milk and impart to it a very high centrifugal motion, and in
doing so the milk particles, on account of their greater weight, force
their way outwardly and the cream inwardly. The machine is also so
arranged that the cream and milk are drawn from it at separate points,
and this operation is a continuous one."

Harry quickly understood the machine from the drawing made for his
guidance, and in Figure 28 a sketch is made, showing how it was
constructed.

[Illustration: _Fig. 28. Cream Separator._]

A frame was made which had a base (A) and two standards or uprights (B,
B), and between these uprights were a pair of horizontal bars (C, C).
These bars served as supports for a vertical tube (D), the tube being
journaled in the center of the cross bars, so that it extended above and
below the bars, and had a small pulley (E) between them.

Below the lower cross bar the vertical tube has two radiating tubes (F,
F), closed at their outer ends, but communicating with the bore (G) of
the tube (D) by means of two orifices (H, H). The bore (G) extends down
to a point a little below the orifices (H, H), and a small tube (I) runs
through the tube D, within the tubes F, F, the ends of the tube being
open. A duct (J) centrally through the tubular piece (D) communicates
with the bore of the tube I. One each side of the tube D is a little
tube (K), which communicates with the inner end of each tube (F). A
receptacle (L) is attached to the tube D below each tube (K), to catch
the cream.

The operation of the machine is as follows: When milk is poured into the
top of the tube D, and the latter is set to rotate at a high speed, it
passes down and out through the ducts (H, H), into the horizontal tubes
(F, F), with the result that the cream is prevented by the heavier milk
from reaching the outer open ends of the tube I. As a result, only the
milk passes inwardly through the inner tube, and is discharged
downwardly through the duct (J), whereas the cream passes out through
the small tubes (K).

The quest for a supply of vegetables was now a part of the daily