New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1864-04-23

c ob.oryq,ions being made in England and Germany.
whore ue Is the prevailing color oi the eyes ara Al Sf
question with MIN whether It occurs soteilo't! J. }
n,os tie fri}.scva VI Of whose eyes is bgck0F hazel
Ia answer to this il seems Tie great mJhyy OF cases
* l-uod ~ WdrimauH lad black iridts.
H.. bAEgLETT said The terrible rnlltoc ac"'eot az
NoNalk Conn., several years since. Wa caused u one
ielgiuccrs mistake in the signal that te ulaW ~ ne
bridge WIS orcn a gentleman no had tis de.,'t n
queer on lis sick bed found that he could not u@'A!,
1isl an celols, Int the engineer was not aware uhth
Prof VAy DIN WYng said there were few painters
of quite t0n in this city who have sane smali
degree Of color blindness and uiiN false coors IN te
l3dsrarcs We uOtce the saTc defects in &'stngu'sh'
inr ecn as ~ colu- Having had great practice III
f.. ding music, he found that about enc III twelve
couS not distinguish the proper scale. men he oshe
tc ceT; in note q the octave. he always eoiAounou
lir. sTr7soN said after the Norwak accident he was
employed 10 invr,tigac the cause. He TOOK IocCmo'
tiyo 81; went orcI fiat pat of the route, ana WIZ" re-
yard 20 the signal he observed 1t was nOS Elsh SV!-
~ bru, the * MS ground. but the woods bchnG
le signal tend d to deceive the eye. lie tad obSeise"
shat there Wers different degrees "a TINS power Oh W.
laueusing color lie had once IN tls employ "tson
abo coud 10. distinguish green from yellow me.
lie imself csud not differences in color as Wen rs
another Gentleman In bis oihce. lie therefore co''
Sod thar IL power 10 distinguish hnts was mol pre-
ci'rIv the SINE in any two persons although there
would be n very general agreement as TO o cV'or'
! RESIDUAL MAGNETISM.
! Dr yoy WALTENHufg.N asserts that the amount oi
remaining in TIE soft iron of an electro mag
rct after tie Cessai on of the electric current -
dane cut on The nner IN which the CsrItnl y ihtc
ruI-.J The amount Is greatest after gradual lLtci-
cenon The residual magnetism IN yer! sOlt iron y
often Of opposite nature to tiai lIeVlCns! 'n,stnt'
scr tie yeri sudden interruption Of strong cuiIeh,
mis- seems e. him furnish strong proof th"t asIet
ism is not caused by the separation oil Two h1iaS on,
by Tie motion Of magnetic inoieeues, 70 wu,cH rs 70
cn,oscd certain amonLt ~ frctonal TcslsInee. lie
CO Iparcs eaei. magnetic mOcculc 10 tprhS "hch IS
bent back If suddenly released II WI return 10 us
orpa position or 60 oyo;sa III giI
The CHAiRNAS adled-The 20" " to retain magnet
ism IN soft iron increases in greater ratio than inc hs
For this reason, persons who had mode small woik.ng
models of electrical machines were often disappointed
On finding that similar machines, made on large scae
id not exert increased power in proportion 70 inc
The CHuRuAN then presented the following interest
in compendium OF recent scientific experiments ana
discoveries:
STILL BOILERS.
Inport1nt experiments have been made IN frussih
with steel boilers Two boilers each 30 feet long anu
fsc ia diameter without fues placed side by SIDE
Ole WIS made Of steel plates Of an inch thick iLe
ofber of iron tlntcs O4i OF an inch in thickness lie
steel boiler was tested by hydraulic pTesSGre Ip 70 10
pounds per square inch Both boilers we're worked Tor
about a year and half under % ID pressure. AttLe
eud II t.t time there lees scale in ihe steel ihan N
lie ron boiler. Tie steel boiler generated - per cent
more steam and evapOrated an average oil lIoo cunle
feet Of water per hour; the iron evapOheh "S' CUBIC
feet The quantity Of coal consumed per j. h0gTs WIS
zoo for tie Steel and 2g72 for the IRON boier Ihe
plates Of tie steel boiler directly over the IRE Iohd
Tie advantages OF the steel boiler are strength hEh
ness rapidly If evaporation. durability under heat the
securing of more perfect ryeIng. and comparative
freedom from scale.
THE PRODUCTION OF OXYGEN WITHOUT FEAT.
Mr. j. ROBBINS has explained before the LONDON
Chemical Society the process used by him ioi obtaining
pure oxygen. The combinations made by hin are not
original, yet they may not be generally known anon
those who separate AID use this gas The compound
used is the peroxide of barum snd biehEoma'e OF pot
with exit tube. and mixture Of dilute suphurio ana
bydIochloro acids is poured Or when the oxygen IS
RAPIDLY evolved. Pero1des OF potassium, sodium,
Stroutium and calcium. may be seyeray substituted
for the vaYoxide OF harum Ind EiangAnhe or per,
imanfaaatc Of potash bnoxide Of manganese. anal
biaoAIde Of lead may 10 used IN tle place OF olc1o
mate Of potash but the cost Of these articles renders
the latter most available. The chemical obhnges IN lls
process readily explained the formation OF tho
suiphae of baryta and peroxide OF hydrogen, or 9Iy
renutcd water. this In contact with chronic acid
reduced TO water. and the sesquiONde OF ehT,inpm
formed; oxygen gas being disenesged from both sub
stances quite pure and d to be Used for medical pur
poses.
Prof JAMESON Of the UniScrsty OF pnto states uia'
the expressed juice Of the berries OF ne eoraTa a
itold s used BY him 10 preference % The Ordinary INK
because IL does not corrode the steel pen There s
tradition that during the spanish admn.sun'ot %
geDt 10 the mother country During the voyage around
Cape Horn the documents got wet those written wan
ordinary ink became nearly hleglbe WINE t.ose WIZ,
ten with the vegetable JUICE renamed uhal"teu.
decree was aft.rwsrd issued that al Government d0cu
ments should DO written with chauch the name Of the
juice. -
Mr. CHkRLEs TONLISsOs communicates 70 tho PAii0' |
.3phica Journal interesting account O many crpor
imenls made by him with the ht1e instrument useI ~
connection with electrical nochine called the electric
iy mill tOHrrigad wnich IS FOL med OF Two OF moro
metallic radical having their eNtremitles bent NJ
rgkt angles and brought TO line point. As prciln
iuay explanation Why he has made these experiments
he gives various opinions OF philosophers as % the cause
Of rs action After detailing Its backward revolutions
I'm the open air aud under glass vase It's Dncton IN r
rfed air It's Increased action nturpennne Denzoe ana
paraine oils IN bol directions and its forward motion
the air after modification Of is points he concludes
while incning TO the opinion OF Cavelo as general
explanation Chat the theory Of the fly requires dIter
ent expression for aerial Us compared with liquid
dleectc its behavior is also different In air OF different
densites and also when wholly aud partially inclosed;
also when the points covered aud even then there
is difference in gctios the presence OF fame from
which infer that its behavior is So modified by ccum
stances that expression represents the Law gov
The CHtITMAS remarked that no had witnessed lately
experiments similar 10 some OF those described by Tom
IiIsOp Of which more would be said hereafter. The
e.rio disturbance is very beautifully illustrated by
the down Of tae mikweed ~ the hand be held at the
distance OF three feet from the conductor while the cleo
trio machine Is In motion, the down darts rapidly be
tween the two 1t does not always move IN right
line but approaches the fingers IN euTyiinear diiec
ton thus showing the portions Of the intermediate air
affected
Prof Roscoe states that the burning Of magnesium
wire. having q thickness OF O.<9' vi u HIliuieter
evolves light equal that of seventy four siearin
candles OF six to the pound. If this hght lasted one
minute O.9s7 Of meter OF wire. weighing O.l2H
GRIN. would be burned. In order 10 produce light
equal 10 seventy. four candles for ten hours where
about twenty pounds " stearn Is consumed 72s grns
o. ma gnesiun would be required This hight has been
used III Enyl land for Photographic purposes.
| THE SPECTRUM or CARBON
! Coal. charcoal and the diamond cannot he yaporHed
by heat when isolated yet NJ Morrin. OF versailles
finding the same spectrum produced by the common
gas flame cyapogen carbonc oxide, carb0nic acid