Savannah morning news. [volume] (Savannah) 1868-1887, 1885-08-10
BITS OF SCIENCE.

method Of hardening and tempering
the Brequet springs of watches has been
discovered. They are so made perfectly
isOehrOnal, and thus is removed one of the
greatest obstacles to the manufacture Of
accurate watches. Another imr rOvement
in the watch Is patent attachment in
side which removes the necessity OF keys
or stem winders, as it winds the watch
automatically. A patent for it has been
taken out by a person Of Chicago.
Experiments with gelatine dynamite
have shed a curious light on the expan-
sion Of explosives. The test is made by in
closing the compound in cavity of lead
whose walls are very thick, capable of
uniform attenuation, but resist rupture
until the last limit OF tenuity is exhausted.
BY exploding thirty grammes Of No.
gelatine dynamite in n cavity whose
capacity was fifteen cubic cenrimetres,
the space was enlarged to 1880 cubic GEN.
tmetres, nearly in the ratio of to 80.
Pressure on the ears is TO be avoided by
persons who wish 10 preserve their sense
Of hearing, Narrowing OF the auditory
canal by the pressure OF a handkerchief
worn over the head and tied under the
chin, as it is commonly adjusted by the
peasant women Of Europe, often causes
deafness. and the "cornettev Of nuns,
pressing tightly against the pavilion Of
Che ear, frequently produces the same
effect. Gradual dilation by laminaria
tents is suggested as rational means Of
cure.
Edison, the inventor, has made the fol
low predictions: "As 30 the changes
which will be effected by electricity with
I'm 80 wears in the city Of New York, /
would say that believe electricity will
propel the cars of the street and elevated
roads. light the city within and without
its buildings, furnish power for all pur-
poses, work telephones and burglar
alarms, deliver the mail, convey parcels,
detect and signal fires, operate FIRE en-
glnes, ard possibly displace animal loco
motion for vehicles"
The diameter of trees varies not only
from summer 10 winter, but from day ~
day. They are larger from noon until
twilight next morning than from twilight
20 noon; they are smaller In winter than
In summer. Water and the sap OF trees
expand not only IN proportion as they
rise above but also as they go below the
freezing point. Low temperature as well
ag high promotes evaporation, and the
troas oyapOrate from their branches In
winter. aud 50 the colder tue weather the
more they shrink.
Blenched linen yarns arc made bril-
haptly lustrOus in "a bath Of 500 parts
water and one part chemically pure tau
min; the famine j. dissolved before added
IN water. SUR well and enter the yarne.
After half an hour enter m fresh water
bath, 10 which ten parts pure glycerlne
and "a spoonful Of egg nlbumine Is added
to 400 parts OF water. Both operations
must be- made in a cold water bath.
When dyed after the impregnation, the
Iuetre Ia communicated 10 the dye. The
bath can be preserved and used for opera
ton.
NM. Depierro and Ciouet have sent IN
communication 10 the Chemical Section
oi Inc Industrial Society OF MulhOuse on
the action OF the electrical light upon
eolors printed On cotton. They conclude
mat me electric light Dleaohes colorlng
matiers. the cOi0rcd rays Of sunlight and
OF the electric light potn Bong elhcnoi0hsi
tbonrh Ia different degrees. The action Of