New-York tribune., 1871-06-26
SCIENTIFIC NOTES.

pU.rKRIE CoD-LIvER 0IL.-Dr. Hager i1nds
,, the addition OF drops oohloroform to 100 rammes
AZ ooyer oil renders the latter agreeable to the TASTE
xbout in the least impairing Its medicinal qualities.
SOLDER FOR Iron, STEEL, AND BRAss.-Dr. q.
+ Dnler has tested the efficacy Of alley for solder
inc IRON 10 steel OF either Of these 10 brass This alloy
.onsists OF parts Of tin, Se of "copper" and u of zne
When applied in molten state 1t viii firmly unite the
metals first named
Co1oR1NG MARRLE,-R. Weber states, in
DiEers Polytechnic Journal that alcoholic solutions of
rchorde of iron are precpitated by carbonate Of
lime aud may therefore be applied TO white marble ior
the purpose Of mparing to Il yellow color The dePn
OF the color Will depend ON the degree OF concentration
given TO the solution.
PICRC PowDER.-Prof. Abel, chemist to the
British War Department, has after prosecuting numer
experiments succeeded in perfecting the new expo
sve agent recently produced by him under the name OF
peric powder material for charging shells Although
1t Is not violent action guucotton, nitr0gyoe-
rne. pcrate OF potash pieric powder much noIs
properties which appear to render peculiarly adapted
tor employment In shells. It's merits are tnt hal oo
aarkabe for Its safety as compared with all other ex-
piOSye agents. being somewhat less sehsluVe 10 H .n
Committee OF poSvcs at WOOwich having pronounced
the powder worthy OF further xperiinen VIII ts Hs
suitability TO the requirements Of the service.
OXIDATION OF IRoN.-Dr. F. c. Calvert
describes paper read before the Manchester Llte-
rary and Philosophical Society, series OF experiments
for the purpose Of ascertainng the conditions under
which iron Is most rapidly oxidzed. One OF the I'M
portant points arrived that carbonic acid promotes
oxidation OF iron He also subsantiated the curious
fact first announced by Berzelius, and now wen
soap and alka manufacturers that cans'c bes
prevent the oxidation OF ron CalNtIts - ,he aIka
prove that the earbOnaes and bcarbonttes 9 tne d
mat In am IRON blade is half immersed in solution OF
these earbOnates they exert such pres IT,
enee on that portion which is exposed 10 common an
that it does not oxidize after period OF TWO years
Similar results we're obtained WI VIII h oGded ~
AREGIsTFRING SPECTRosCoPE.-Wllliam Hug
rins described before Royal Society registering
spectrosccpe devised by him. and constructed by Mr.
Grnb optieian OF London The short duration OF the
totaty OF solar eclipse suggested the Importance OF
oe method by which the position of lines in the spec
trum of a corona might be instantly registered without
removing eye from the instrument so as to avoid the
loss of time and fatigue to the eye of reading mcrome-
erhead or the distraction Of the attention and other
ineonveuences OF an Illuminated scale. The object Is
accomplished by fixing pointer In the eyeplece OF tne
IpectrOscOpe, to move along the spectrum Dy 9neR
motion screw arm of the pointer Is connected by
with second arm to the end OF which are
two needles These needles move over aoCbt % 'S0 m
from red violet. Under the extremity OF the
arm is frame srx nSeq neS Sh IN f %it two 1 pDs
which pierce the card. This frame can he moved TOT
f the card under the points Of the needless on each OF
these portions Of the card spectrum can De registered
BY means serewhead at the side OF the telescope
he pointer can be brought into coincidence with line
finger OF the other hand is then pressed upon one o
the needles at the end OF which traverses the
card and the position the line is instantly recorded
by minute prick the card bright line is distin-
sSs Shes S by %Se5 Shs second mark i made medatey
below the other In all cases the position OF the line Is
registered by the needle the second neede Delng
denote that the line recorded bright one ~
found that from to l2 FTaunnoier nes % IoG De
rtstered IN about Y seconds and that when the same
lines recorded five times in succession on tne same
card no sensible difference Of position could be detected
between the prieks registering the same line In the sew
eral spectra