The Indiana State sentinel. [volume] (Indianapolis) 1868-1895, 1885-04-29
DUBIOUS. USEFUL AND SCIENTIFIC.

Galvanized iron water tanks must not be
employ ed on board of French men of war.
DIR. Venable in g paper read before the
Amer can Chemical Society, has shown that
wsier passed through 200 yards of gslvaniz I'D
iron pipe took up % grains of zinc carbon
ale per gallon.
Balfour Stewart and Willism Liant Car.
penter have made preliminary comparison
between the dates of cyclonIc storms of Great
Britain and those of magnetic disturbances
81 the Kew Observatory. Finding that in
thirty cases compared twenty-three pre-
sented distinct magnetic disturbance soma
what more than day, the investigators con-
tequeptly intend TO pursue the subject ex.
bsustiveiy.
at a meeting OF The Geographical Society
OF Paris, NJ. Schrsder read paper on toe
masses OF snow moved about By ths wi al
among mountains. These mssges are not
moved about by chancs-they obey very
simple laws which cause then 10 bs d.
posted az spots whore the wind is dimin.
lsbed In intensity, end give thsm forms
WHICH may be essiiy Snaly zed II the quality
OF the snow, the fOTra and direction of the
wind, End the cont. ur OF the mountain be
tsken into account
NJ. CASTOR TIouve is said 10 bsve con-
stl ucted u portable electric glow lamp, in
tencsd for use where there Is an explosive
atmosphere This ls mp is intended to be of
service in mines, Ce lulose factories. -four
miis, spinning mills etc. TX is automatic in
action and il IS stale to be very simple in
construction. There are two varieties OF the
lamp made: one OF which will only light
itself when taken I'D in the hand; the other
when II Is hung up or put down. Tbs ur-
tent IS produced by battery contained in
tie lamp.
Admiral F S. Tremiett writes that on the
souiptUred dolmsns of the Department of
Morbir an. France, about eighty sculptures
had been found. invariably on ths interior
iU3 faces CT the capstones sn0 their supports.
1t is 6 remarkable that they ara confined
within distance OF shout twelve miles, ard
sIe site eted near tho sea coast, beyond which,
slth0ugh the megaliihs are nOmsrous there
is g complete absence OF sculptures. The
sculptures vary in intricacy, from some sim
pie wave lines aud cup markings TO some
that have been comp AIRED 10 the tattooilg OF
the New Zealsnders.
Three coats OF soluble glass, each applied
at an interval OF q day, the Pottery and
Glassware Reporter says, sufficient to
preserve porous materials indefinitely at
CO st OF about fifteen cents per so 1are yard.
When applied upon old materials it is nee
es airy TO wash them thoroughly with wster
hIst The degree of concentration of tue so.
buttons to be used varies with the materials.
For bard stones the solution should marx =
to % Bsume; for soft stones with coarse grit
So 10 -; Tor calcareoUs stones OF soft tex ture
Sc 10 -. The last coating shou,d always be
with dilute solution OF g TO 4 only.
Major Allen Cunningham asys: "Tnere
is a defect OF eyesight common among The
nativss Of India known as 'ratsudhi,' lit,
night blindness Persons affected With this
hsye either ordinary powers of vision by
6sy light or else powers Sd little lees affected
than ordinary as to feel no ipcon ven isnce, 90
tbst usually no defsc. is noticeab bic; while in
Zee bic twilight their sight fails in the most
extraordinary way. aud in the dusk, they
become lin bad cases) practically blind of
course there are all degrees OF this affection,
bat the strongly marked cases alone are
likely 10 attract attention. By medical men
in India this affection is said to occur mostly
among men living on low diet, (chiefiy OF
cereals. and the palliative treatment is to
prescribe meat diet. This affection is rarely
noticeable among Europeans in India,
though l have sometimes noticed marked
differences in clesrness OF sight among then
a'so amounting to slight night blindness