Evening star., 1913-12-30

justed equipment. If the belts and gear
ing are SO arranged that they do not ado
their vibration to the noise of the saw
better results are noticeable throughout
the shop.
Machinery designers are now giving
scientific study to noise prevent on The
primary pur-
Scientific Study Given pose of ma
to Noise Prevention. proyement Is
to reduce the loss OF power and to pre-
serve the life of the machine by the
elimination of friction. The greatest
noises OF most shops are due to friction
which actually impairs the value OF the
machine Consequently, noise suppression
and durability are achieved by the same
means. Noise is sometimes due to run
ming the machinery at speed too high
for the adjustment Of the gears.
A manufacturer at Bridgeport, Con-
necticut. who has been studying the sub
Jet. claims that gears running above
600 peripheral feet a minute are apt to
be noisy and those RUNNING just below
1t are not. The advantage gained by the
added speed Is more than lost in the ef-
feet of the noise and the added strain
upon the equipment. The text books put
1.200 feet as a limit Of speed. yet auto
mobile designers run gears up to 2,OCo
feet at times. This is on low gear and
at a maximum engine speed. To pro-
duce quiet running at the higher speeds
the gears must be perfectly fashioned.
One of the reasons for the noise in many
shops is that the gear speeds are ex-
cessive in comparison with the accuracy
of the machinery. Such speed is an ex-
travagance because of its effect upon the
entire equipment.
The system of fabrication has much to
do with the suppression of noise and fric-
tion in many large machine shops The
OF an oil can, which may be effective or
not, according to the reliability of the
man in charge. Automatic fabrication is
a feature of modern machine construction
which tends toward noiselessness and al
SO toward the highest degree Of speed
and efficiency.
The effect of a continual noise in any
locality brings about speedy deteriora-
ton in the
Continued Noise Means value of
Property Deterioration. The n location
Of factory in a residence district is
always objected to by the house owners
for this reason. With the provision OF
noiseless machinery and the numerous
other reforms being made in factory
management this objection will be ma
terially lessened in the future. A model
factory was erected recently in resi-
dence section of Philadelphia, greatly to
the horror of the property owners, who
had visions of disturbed slumbers in the
early morning and unpleasant grinding
noises throughout the day. No such
conditions appeared. The factory opened
in the morning with no more noise than
a store. The workers appeared on time
and went quietly to their places. All day
long force of efficient hands manipu
lately smoothly running machines which
emitted only a little whirr of noise not
audible across the street or in the house
upon the adjoining lot Yet this factory
turns out large productions each year.
1t pays its owners better profit than
do the factories with noisy. poorly adj
justed machinery, which are making the
same articles in other less desirable To-
cations of the city.
The automobile is one Of the greatest
noise producers of the present time. The
best machines now speed along silently.
Any noise other than the alarm signal
indicates a reimbursement. which should