The Kenosha telegraph. [volume] (Kenosha, Wis.) 1860-1888, 1872-09-12
THE MOST EFFECTIVE VELOCITY.

The velocity of different parts of ma
chinery may be either high or low And
certain parts may be made to revolve or
otherwise move with so much rapidity,
that large proportion of the effective
force will be absorbed in simply giving
motion to the working parts. The grand
aim, in the construction Of any kind of
machinery, should beto give each part a
motion, or velocity, that will operate Che
working parts with the greatest efficiency
and at the same time absorb the smallest
amount of the effective force that gives
motion to the working parts. For exam
Iple: horses when attached to thresh-
Ii0g machine, can exert their strength
with less fatigue and greater efficiency
when they can move at a slow pace, known
as their natural gait. Now then, the
cylinder is the working part of the thresh-
er. The machine may be geared SO high
| that all thu effective force of the horses
will be absorbed in simply giving motion
20 the cylinder, as they move at their
natural gait. If an attempt were made
to thrash grain at such high velocity, it
would be perceived that there would be
no available force that could be employed
to thresh, as the thrashing of only one er
two sheaves would sensibly retard the
speed Of the team. Here is another point
gained. On the contrary, by taking the
other extreme, in which low velocity is
given to the cylinder, it would be per
ceived that the cylinder does not revolve
with sufficient rapidity to operate with
maximum efficiency. Here, then, are
three important points for determining
the most effective velocity for the cylin-
der Of threshing machine The gait Of
the team must be made the starting point.
The next consideration will be to make
cylinder neither too heavy nor too light,
to balance the force that gives velocity to
the various parts of the machine. Then,
by series of carefully conducted expert
ments In thFeshiug grain, the most effec
) tive velocity is found midway between a
high velocity and the motion thai has
been found quite too slow to thresh clean,
and at the same time thresh as mach grain
as the force applied is capable of, when
every part of the machine revolves at the
most effective velocity. In The construt-
ton of all kinds of machinery,1t is always
OF the greatest Importance to arrange the
working parts so as to move at such
speed that the muscular force employed
by either men or animals, may be used in
the most economical manner.
A laborer, for example, will carry one
hundred pounds of material at one load,
to the attic story of high building, and
return, with little fatigue in four minutes
but let MIN take only twenty-five pounds
at once, and attempt to make four jour
neys in four minutes, to carry one hun
dred pounds, and his powers of endurance
will be found utterly insufficient to with
stand the fatigue incident to the I'M
natural gait required II this case.
Let a large man, for example, when
walking by the side of small boy, at.
temEt to keep step with the little patter-
ing feet, which play like drum sticks,apd
he will find that the fatigue produced by
he quick and unnatural motion of his
limbs is far greater in order to move his
body only few rods than it would be to
travel mile or moro at his slow, natural
gait.