The Mt. Sterling advocate. (Mt. Sterling, Ky.) 1890-current, 1891-06-02
INDUSTRIAL NOTES.


which circular saws are put is that o
log cutting, working up the rough
timber into lumber. But not all saw
yers are as familiar with the condi
tons which govern the operation Of
the circular saw as they should be.
These are the only tools used in
cutting and dressing lumber that
within themselves have certain in
herit conditions to govern their speed,
and knowledge of this is an import
ant part of a sawyer's ability and
education.
A great deal, of course, depends
upon the material and manner in
which the saw is made, whether it
has been hammered slight" or "slack"
on the periphery. Assuming that on
account of the centrifugal force the
steel is stretched from the eye of the
saw toward its periphery, great deal
would depend upon the condition of
the saw at the beginning. A saw
that is hammered loose at its periph-
cry can be operated at a much higher
speed than one that is tight or
stretched.
In explaining this, let us suppose
that saw is started up and gradu-
ally increased in speed. For a time,
and up to a certain limit, according to
the above conditions, the stiffness or
rigidity of the blade will be increased.
Above this limit it begins to diminish,
and at very high velocity the plate
becomes timber and plant as a piece
Of paper, and if the speed is kept up,
the periphery of the saw will assume
an undulatory or wavy motion.
When in this condition it is as SEN
sitive to pressure on its side as if it
were made Of .s4eet Of paper.
This>whi1e st may form an interest
ing experiment, is also valuable in
the consideration of the subject of
speed for such tools. 1t shows be-
yond a doubt that there is a specific
speed at which saws should be run to
do work to the best advantage and
within the limits of safety and econ
omy.
Sawmill men as rule are not suffi-
GENTLY familiar with such matters,
and only consider the subject with
relation to the amount of production.
There is an important matter for care
full study in the manipulation of saws,
and chance for the exercise Of good
in regulating their speed
for the different classes of work to
which they are Observation-Disclosures
Gazette.
FLYING MACHINE.-The air (of i'm
aginaton) is fnll of flying machines,
but, most of them, when put into the
crucible of practice, show very little
improvement ever the traditional eff
forts of Darius Green. In the several
methods lately proposed the electric
motor is the propelling agency. 1t is
pretty safe to predict that aerial loco
nation will not be realized with the
electric motor until source of
electric energy be found which will be
sufficiently light not to interfere
materially with the buOyancy of the
air ship. The great strain on the
trolley wire, which would be q neces-
sary incident of terranean supply,
renders such system impracticablc.
The air ship is necessarily, more or
less, under the control of the wind and
could could only make Roadway on
the lacking principle, involving the
action of resolution of forces, and this
would produce such great lateral
strains on the fixed supply wire that
its strength must needs be very great.
An overhead railroad or telpher line
would largely discount this scheme in
chances of practical realization. The
latest scheme is to force the ship up
ward by an electric motor and then
spread inclined wings to give the ship
a forward thrust as it descends. The
protector does not mention how the
ship is raised after the first descent.
If the rise occurred in New York the
fall might be on a Westchcster farm
or the bosom of the Atlantic, where
electricity is, unfortunately, not on
tap Exchange.
ANOTHER USE FOR THE TELEPHONE.
The telephone is about to have a
new application-that Of foretelling
storms. A new discovery has been
has been made as to one of the
properties of this means of transmit
ting sound. BY placing two iron
bars at seven or eight meters distance
from each other aud then putting