The Dallas daily herald. [volume] (Dallas, Tex.) 1873-1887, 1881-06-23
spark q of Science.

Copper, if suddenly cooled, becomes soft
and mslleable; if cooled slowly, it hardens
and becomes brittle.
The New York Board of Fire Insurance
Underwriters have decided to rate as "spe-
cslly hazardous" all buildings using the
electric light, unless the wires are insulated
The excessive resonance Of churches, NJ.
I Able Barrett says, can be modified to any
degree by the simple exDedient of stretching
Iron wires across the dome.
Mr.. W. H Preeco suggests that the flow of
tidal waters, and in elevated stations wind
p>wer, might be used 10 reduce the cost of
producing the current for tho electric light.
NJ. Michel Rossi states tina. the aecumu'a-
lions of fire damp are accompanied by faint
subserranean noises, which the microphone
indicates with much sensibility. By grating
sounds this instrument proclsims the escape
OF gas, and Mr.. Rossi argues that thia added
TO bsrometic warnings, would forewarn the
supenntendents Of mines and consequently
prevent explosions,
The French government intends to estsb-
lsh an observatory at Cape Horn for the
purpose of accommodating data regarding
'Sl'Vei'hl H"SUttISu' lUUsG WHO hT0 10
hke charge of the establishment will sail in
The came vessel which is to bring out the
astronomers, who will try 10 make what
Venus. .
1t will surprise many 10 learn that rice
pas a nutritious percentage Of 90, while
peef.hss but 20, Still civilized man will
Adh re to the latter Wit, the idea that it has
!he most nourishmert. Tho difference
between a pound of rice is verv u i;ad, tie
latter being so per CO.. fhta ,er and 100 per
cent more valuable 10 the ,ommon laborer
han the beef diet.
ltappears that some wholesale dealers in
NE North Of Russia have each season to
dispose of more than 100000 of bad eggs
pMd by hem. Those eggs lie divide, in O
even classes, according 10 the stage of de-,
composition. From some of them he pro,
poses to.extrsct tho socalled egg-oil, which
may be used in the manufacture Of soaps,
and he also suggests that eggs unit for HUI
man food may be found of advantage in
making artificial manures.
The Nature learns that NJ. Alpband, the
cifec!or Of pubic works IN Paris, has obtains
q the tender of Siemens g. Co., for con-
,fucting an electrical railroad from the Place
90 Ia Concorde to the interior of the elec'ri-
a' exhibition. M Alphsnd has acceded to
vac desire Of the company, and will f.vorably
lecommend the proposal TO the commission
on sewers, appointed by the Municipal
Vouncil, that when the exhibition IL closed
we electrical railroad will be available TO the
public in the Champs Elysees.
A correspondent of the Baltimore Sun
mus describes filter, which he SAYS he uses
MN perfect success for all the water his
lsniv requires. II 10 gallon-gla,s funnel
wIn small piece OF sponge 10 the bottom,
md on which rests half dozen slender sticks
70 facilitate the percolstion, then placed at
pulervals all around and beneath a piece of
muslin a foot or SO square. The muslin IA
lled with, say, a pint Of closely powdered
casrcoS'. thorough this he filters the water.
As frs. a liule of tho charcoal passed
through, but II soon becomes perfect filter.
A suggestion TO employ artificial lights for
VOC capture ard destruction of noxiou, 10
lec's has found considerable favor. A med-
was awarded at tho last exhibition of sC-
!lcullure and ipscotolngy at Paris for lamp
Especially adapted for catching irsec Q. The
Electric lisht has been found 10 DO a very Of,
iec''va Insect trap and lie eventual coming
mo usc for this purpose Ia bug infec,ed
Ssfdens aad orchards may DO regarded AZ
auong Tho things that arc possible.