The Nevada journal., 1859-10-21
FRIDAY MORNING, Oct. ,lsl, 1859.
INTERESTING vAR,RrIEs.-Frou

INTERESTING tARtETiES.-FTOM
the Scientific Americam.-It is an
nounced, for the benefit of those per-
sons who did not get a sight of the
comet, that il will again appear be-
fore the public, for few nights, in
the autumn of 2147. The most Sc
cure fastening ofyour chamber-door
Is a common bolt on the inside if
there is none, lock the door, turn the
key SO that it can be drawn partly
out, and put the acash-basin under IL.
that any attempt to use Jenny or
put in another key, will push it out
and cause racket among the crock
cry, which will be pretty certain to
rouse the sleeper and rout the robber.
Barrow, the Chinese traveller,
computes that there is more material
in the great wall of China than in all
the houses of England and Scotland
combined. . A short time ago, la
DIV advertised IN the London Times
for housekeeper, and received up
" ards of 1000 replies, 500 of which
came to hand by the first delivery.
-. Human hair varies from the
250th to the 600th part of an inch in
thickness. The fiber of the coarsest
wool is about the 500th, and that of
tho finest about the 1,500th part of
an inch in diameter. Silk-worms'
silk is about the 5,0O0ih part of an
inch thick, but the spiders line is six
times finer. and a single pound of this
delicate but strong substance would
be sufficient to encompass the globe.
German Psychologists affirm that,
of 20 deaths of men between Is and
2S years of age, le originate in the
waste of the constitution induced by
smoking IA French surgeon has
been making experiments upon sores
and wounds of persons of frail con-
stitutions. by employing the comm on
hand. bellows to act upon the part for
Is minutes at a time four times day.
His success is announced, on medical
authority, as encouraging - Sound
Is always propagated outwards in
straight lines, but rccoils like ball
when driven against an obstacle
which. by its dimensions, is sufficient
to intercept the undulaiion. 1t will
pass with great velocity through glass,
and timber, and massive buildings.
but is beaten back by mountains and
caverns. This reflection of sound
produces the beautiful effect of echoes.
The engines of the large ocean
steamers make about 100000 turns
in crossing the Atlantic. between Liv-
erpoel and New York -. With four
weights of respectively l h.. 8 lbs,
9 lbs. and 81 lbs, any number of lbs,
from to 40, may be weighed The
annual consumption of coal for gas
making in Londonis estimated at S40,-
900 tuns. the product being 7.72S,00o,
900 cubic feet of gas Boron was
some time since crystallized by Woh-
Ter and Deville. and the product, in
brilliancy and hardness. rivaled the
diamond The widest span yet
made in timber bridge is believed
10 be that Of the Schulkill bridge, at
Philadelphia. the clear opening Of
which is $40 feet The highest
mountain In the world is Mount Ever
est, in the Himalayas. Its height is
$4,000 feet, or five and a half miles
above the sea Veins of coal, hav.
ing caught fire. sometimes burn for
wears. An anthracite coal vein. un-
der Broad Mountain, Pa, has been
burning for % years, and there is no
prospect of its extinction whilst more
coal remains to be consumed The
friction of iron journals in brass box
es, with film of good oil interposed,
has been found, in some cases. to be
as little as 1-90th of the weight. Or
dinarily, it is about 1>30th of the
weight; while, if the surfaces are
wiped dry from oil. it is about 1-1oth.
The power required to drive an
Is inch trail of rail rolls. including
roughing and finishing, also, one pair
cf fcropping-shears, eight straighten~
ing presses. saws, &C., sufficient for
making 900 tuns of rails weekly, has
been found to be 239 horse power
In this case, the rolls make SIS revo-
lutions per minute The popula-
tion of Rome. at the highes: period of
its power. has been estimated at
6.S00,0OO. The present population
OF London is about 2,600.000. The
present population of London is about
2.sO0.O0o. The entire population of
Paris, including that of all its metro
politan suburbs. is about 1,500 900.
That of New York. estimated in the
same way, is l 100000 =. Hydraulic
mortar was first made in London, in
1896, from the septaria in the Isle of
Thanet. Roman cement contains
from 80 to 40 per cent of clay. and
hardens in a quarter Of an hour
When clayey limestones.are calcined,
the theory is that the silica unites
with the alumina, lime and magnesia.
forming a silicate which, when mixed
with water. takes up water of crystal-
lization. like plaster of Paris, and be-
comes as hard as rock :. .Huntsman,
Of Attercliffe. near Sheffield. Eng,
was the first, in 1850, to make cast
steel.