The Red Cloud chief., 1878-11-21
TINE WORLD OF SCIENCE.
New B:Imsstc sss D.

new form II elastic marking stamp
has lately be-u patented by Piep"r. II
Dresden. This Is based upon the elias.
tic properties possessed by n mixture Of
gelstinc and %glyccrinc. which rrsists
perfectly the action II oils and p~rtrul..
um. bat IL moi sufficiently permanent.
To give u the desired durability. the
stamp. "a made. j. emrrscd for about,
three minutes In n mixture In the pro-
portion of one part 81 tanin to fifteen
parts ~ alcohol. aud then allowed to
dry with the stamp side underneath.
This Is Ia bee repeated hourly for ,hrc.
or four hours, and for the last ir,i
the tanned face u 10 be- washed with
n sponge with lukewarm spirits. In or.
der a. remove the superfuous tanin.
prevent its action on the cnloring sur.
face. A lea,hcr-,ikc surface with an
elastic body u thus produced. which
answers all the purposes ~ the ordina-
~ rubber stamp NJ present In use. be-.
sides being .auch o easily pre-.
pared.
Ihc Satellites oG Wars.
The authorities III the National oh.
~scrvaiory have jus, published. In n
handsome qunrto pamphlet II thirty.
six pages. Prof, Asapb Hairs obscrva.
tons oi the satellites ~ Mars. with the
elements 81 their orbits. and data for
calculating their positions during 1879
Mr.. Hall has finally adopted for the two
Moons the names suggested by Mr.. Ma
dan. Of Eton. England. namely. D.imos
for the outer satellite. and Pbobos for
the inner satellite. From an exhaust.
i've review Of the various observations
81 these minute bodies with the great
Washington rcfractor. he also dcduccs
the elements of their orbits and com
pares them with those obtained hy 9th
ar observers Defines rcyolNos around
Mar In ! 262i29 mean solar DAYS. aud
Photsps In .3is92tt 81 n DAY Both ~
them NOV. very nearly Ia the plane 81
the equator of Mars. The hourly mo.
ton 81 Phobo-. IS seen from the sur
face Of Mars. Is a." OS9. and on acCount
ii its rapid angular movement. and H..
neArn~ss 10 the planet. this sai.llit. will
present q singular appearance 90 any
inhabitants of Mars II will rise in the
west and set in the east. and will meet
and pass the outer moon, who's. hourly
motion j. only IL $50. The distances
III these satellites from the center are.
for Diemos, II, 800 miles. and for Pho
hos. $500 miles. The inner satellite Il.
the brighter 81 Tn. two. but more din /.
cult Ia 80" on ccou 81 it, closeusss
To the planet. Tn. size II the satel-
litcs 10 no, well known. though Z, is Ger
tain they are very small. From com.
paratiyc measurements ~ their light
Prot. Pickering. II Harvard. estimated
Dcimos Ia be six miles in diameter. and
Phobos seven miles. Other observers.
however. have been led la place them
NJ from ten TO fourteen miles. The mas.
of Mars. as determined from the motion
of the satellites i the I 9gs1Jp1th part IL
that Of the sun.
srsdssg sss~ Itm~ by she Mars.
The scts "a Obssrrsr. ~ Boston. con.
tsins an interesting paper by =. G..
Chandler. IT, on a new method 81 find
ing the time vithou, instruments. He
says;
lie; two plumb lines he suspended
at . considerable interval. say two or
three feet apart. In a direction nearly
north and south. and ~ such length
that the eye, placed near the lower end
~ ~ 81 them aud booking toward the
other. ~ Observe the transit Il stars
across the latter up "a an altitude Of,
say ai least nifty degrees. Ie, the poinis
al suspension be movable laieraIly. 90
that the lines can conveniently he
brought into the same plane with the
polar star, By so adjusting them that
the eye. PLACED al n little distance from
onc line, sees " projected Agains, the
other and the pole star at the same time.
IL 10 evident that in this position. u plane
passing through the lines will cut The
sphere In q vertical circle. the angle he
tween whsch and the meridian IL the
aximuth 81 Polssis ri the tirse e OBJ
s~rvatsoo- II, nov, the observer re-