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Matthias, F. T. (ed.) / The Wisconsin engineer
Volume 33, Number VIII (May 1929)

Geissman, Theodore A.
Engineering review,   pp. 290-291

Page 291

their maintainance and operation. A
course in Hotel Administration, with
engineering as an integral part, has
been given since 1922; but this is the
first time the subject has been open
to summer course students since the
institution of the four year course.
  The use of chromium plate for
automobile radiators, trimmings, and
for plumbing fixtures is now almost
universal; but the metal is finding
application in a new field: that of
reflecting surfaces for automobile head-
lights. The recent study by two
Bureau of Standards scientists of the
reflecting properties of several materials
has revealed certain inherent char-
acterists of these materials in the re-
flection of light of various frequencies
of vibration.  This research has fur-
nished data on the reflection of light
waves not only in the visible spectrum,
but in the infra-red and ultra-violet
ranges as well.
  The observations regarding chrom-
ium show that it has a higher re-
flectivity than nickel in the ultra-
violet range, a high maximum at 425
millimicrons (violet), and a wide flat
minimum extending from 600 (orange)
to 2000 (infra-red) millimicrons. In-
cluded in this study was a test of the
resistance of the various reflecting sur-
faces to "dulling" when exposed to
ultra violet radiation.  The dulling
effect of ultra-violet light upon chrom-
ium was found to be very slight. The
marked superiority of chromium to
nickel as a reflecting surface was well
demonstrated by the work done on
these metals.
                 -Scientific American
   Dynamite and T. N. T. were em-
ployed recently in the construction of
the new highway bridge across the
Mississippi from Cairo, Illinois, to
Birds Point, Missouri. In sinking the
caissons to the river bed, a hard, shale-
like clay was encountered which clam-
shell dredgers were unable to remove.
The caissons were raised some five feet
above the stratum of clay, holes bored
into the river bed below them, and
dynamite set off. As the depth in-
creased, misfires began to occur due
to the difficulty of detonating under
the high pressures. Special fuses were
obtained which contained T. N. T. and
were capable of detonating under con-
ditions under which ordinary fuses
would fail. These fuses were of such
a size and shape that they could be
inserted into a hole drilled longi-
tiidinally into the dynamite cartridge.
Five or six cartridges were strung to-
gether like beads on a string, the fuse
in the topmost one. This final arrange-
ment worked splendidly and the piers
were lowered successfully with no
further difficulty.
                 -Explosive Engineer
  The River Shannon, long glorified
in song and story, and considered as
symbolic of Ireland as the Shamrock
or St. Patrick himself, is being har-
nessed to furnish power for practically
all of Ireland. A large hydro-electric
plant is being built at Andacrusha,
near Limerick, about 120 miles from
Dublin. The area to be supplied is
in excess of 25,000 square miles, and
high tension lines up to 225 miles in
length will be needed to distribute
power over this territory.
  The ultimate capacity of the plant,
at the completion of the whole pro-
ject, will be 180,000 kilowatts from
six generators of 30,000 kilowatts
each. The "partial development" now
under construction will consist of only
three of these generators with a com-
bined output of 90,000 kilowatts, and
will cost about 15,000,000 dollars, ex-
clusive of the transmission equipment.
The electrical and mechanical equip-
ment will cost more than 2,500,000
   The temporary power requirements
during construction are being met with
a 4500 H. P. Diesel engine installation.
An especially built railway, using both
steam and electrically driven locomo-
tives has been built from Longpave-
ment to the various sites of construc-
tion; material is brought to Longpave-
ment by motor truck from Limerick
Harbor.   Plant equipment was not
available in Ireland to meet the enor-
mous demand made by the magnitude
of the undertaking; and so it was
necessary to import from Germany
over 125,000 tons of machinery, equip-
w'ent, and fuel. The work is being
done by the Siemens interests of Ber-
lin, Germany.
                 -Scientific American
  The blackening of high intensity
tungsten electric lamps, caused by the
depositing on cooler parts of the bulb
of tungsten volatilized from the fila-
ment, can now be removed by a practi-
cal method, recently announced by
the Lamp Development Laboratory of
the General Electric Company, and
now being incorporated in all high
intensity lamps produced by that com-
pany. The new deposit remover coI-
sists of a small amount of powdered
tungsten, a tablespoonful in most cases,
which is placed inside the bulb before
it is sealed. By removing the black-
ened lamp from its socket and shak
ing it, this coarse tungsten powder
sweeps off the coating of tungsten on
the glass, and restores the lamp to its
original efficiency, as good as new.
The deposit of tungsten-soot on the
glass absorbs lights and radiates heat,
and in time the temperature of the
glass becomes so high that it under-
goes devitrification and deformation.
So this new method for removing this
deposit will increase greatly the life
and usefulness of tungsten lamps, both
in length of service and in efficiency
while in use.
   When steel construction began on
a 53 story office building in the Grand
Central zone of New York City
recently, it became necessary to re-
move a fire escape projecting from the
wall of an adjacent 20-story hotel, as
the walls of the new structure were
to be in contact with those of the
older building at that point.
   Before the development of the oxy-
acetylene process this would have
been a tedious and long drawn out
task necessitating weeks of hard work.
The oxy-acetylene cutting blowpipe re-
duced the operation to a matter of
days. The manual labor involved was
confined to the simple task of guiding
the oxy-acetylene flame along the path
of the cut. Railing, frames and sup-
porting members were quickly severed.
Where steel supports were anchored
into the mortar and brick of the build-
ing, the cut was clean and close and
accomplished with the utmost ease.
   The oxy-acetylene cutting blowpipe
is truly a remarkable tool. For struc-
tural or demolition work it has proven
        (Continued on page 294)
MAY, 1 929

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