The Londonderry sifter. (South Londonderry, Vt.) 1883-19??, 1889-06-06
SCIENTIFIC AND INDUSTRIAL

Smoking is said to be good for hay
Fever.
Iron railroad ties have been tried In this
country and given up,
California roofing slate Is said to be
the finest IN the world.
A new industry is the manufacture OF
ink from the oil and grease extracted
from spent cotton waste.
The Chinese laundrymen at Pittsburg,
Penn, bleach their washes with chloride
of lime, and the garments soon rot away.
An English firm has Just brought out
a new sensitive flame burner, which can
be extinguished entirely by a loud noise.
A new process of hardening plaster Of
paris has been discovered whereby 1t can
be adapted to the construction OF floor
ing In place Of wood.
A French scientist Of tho name OF
d'Assier declares that the earth Il gradu-
ally getting colder, and that the severest
period will be reached in the year IL $50.
White lead is manufactured by the new
Hannay method direct from the ore In the
space Of a few hours, while by the old
process 1t was Il matter of several months.
The new Hengst powder made from
straw Is said to be smokeless, flameless,
practically non-fouling and non-heating,
aud being granular, is not liable to pack.
Pulu, the vegetable silk" used by up
holsterers for fine cushions and so on,
looks like brown thistle down and grows
upon the leaves and stalks Of tropical
fern.
At the German surgical congress, which
recently met at Berlin, more than one in
stance was shown of the entire removal
of the larnyx and subsequent ability to
speak.
Electricity for the cure of consumption
has attracted much attention of late years.
either for generating ozone for Inhalation
or for its influence on the vasomoters as
current or as static electricity in baths.
Water glass, which is simply glass with
such excess of alkali that it dissolves In
boiling water, is one of the most valua-
BILE substances for fire proofing both wood
and cloth, and much used in the arts as a
vehicle for mineral paints:
Somebody has discovered that peach
stones can be used as fuel, and now they
command Sc ton in California. A sack
of stones weighing eighty pounds will
last as long as an equal weight of coal
and give greater intensity of heat
The ultimate extension of wrought iron
is one-six- hundredth part Of its length.
The working strain is from one-sixth tc
one-fourth the main strength. Resistance
to flexure acting evenly over the surface
equals half the tensile strength.
The British gunboat Sandhy, while under.
going experiments to determine the amount
of water required to make up for wastage
on six hour run at the most economical
rate of speed, consumed coal at the rate
Of 2.64 pounds per horsepower per hour.
If you add Is to the pressure pei
square inch in pounds on a given boiler,
and divide this sum by Is and then multi
ply the quotient by "a, the resulting
product will be the number of gallons OF
water required by that boiler per horse
power per hour.
The surface of the moon is exposed
during its long cloudless day of somt
$50 hours to the direct rays Of the sun
which shines upon it with fierceness fal
beyond anything experienced on thu
earth, and afterward it became almos
immeasurably cold from its night of SINH
lar period.