The San Francisco call., 1910-08-09
Answers to Queries

MOONS MOVEMENTS s. b., Suisun.
What are the moons movements?
The moon always presents the same
face to US, as is evident from the per-
manency of the various markings on
It's surface. This circumstance proves
that with respect to the earth she re-
wolves on an axis, and the time of rota-
tion is exactly equal to the time of
revolution around the earth, viz.
27:32166 days. The moons axis is not
perpendicular to the plane of her orbit,
but deviates therefrom by an angle of
about degrees Al minutes. In conse-
quence of this fact, and of the inclina-
ton of the lunar orbit to that of the
ecliptic, the poles of the moon lean al
ternately to and from the earth When
the north pole leans toward the earth
we see somewhat more of the region
surrounding 1t, and somewhat less
when 1t leans the contrary way. This
displacement is known by the name of
libration In latitude. The moons mo-
tion on her axis is uniform, but her
angular velocity in her orbit is subject
to slight variations by reason of the
form of her orbit; hence it happens
that we sometimes see a little more of
the eastern or western edge at one
time than at another. This phenome-
non is known as libration in longitude,
MARTIAL LAw-Subscriber City What Is
martial law and who has the power to de-
clare It?
1t is the law administered by the
military power Of a government when
IT has superseded the civil authority
in time of war or when the civil au-
thorities are unable to enforce the
laws. Strictly it is that military rule
which in time of war is conferred in
relation to persons and things within
the scope of active military opera
tions This means that civil law is
suspended. and all government is un-
der military regime. Who shall de-
clare martial law has never been bet
ter answered than when the duke of
Wellington said: 'It is the will of
the commander in chief
NIGHT GLASS. City. What is the prin-
ciple of what Is known as might glasses, aud
is 1t true that one can see as plainly with them
as In the day?
A night glass is simply a small
terrestrial telescope, or spy glass, or
dinarily in the form of a large opera
glass. with an unusually large lens
in the end toward the object to be
viewed, which serves to concentrate
a large amount of light and so render
objects seen at night much more dis
tinct than when viewed by either the
naked eye or an ordinary spy glass.
Nothing seen through night glass,
even In the clearest night, can appear
as distinct as in daylight.
HANDKERCHTEF-S Oakland When
did the handkerchief first come into use?
From a historical study of the pocket
handkerchief, it appears that man.
kind is indebted to Italy for it's intro
duction. The use of the handkerchief
WAS unknown in society until the first
half of the sixteenth century. About
the year 1910 Venetian lady first
conceived the happy idea of carrying a
'fazaletto,' and it was not long before
her example was followed throughout
Italy. The handkerchief crossed over
the Alps into France, where its use
was immediately adopted by the lords
and ladies of the court of Henri H."
DRAWING PowER-Cftys Reader City.
What is the drawing power Of horse on va
rious kinds of pavements?
Rudolph Herring, a celebrated en-
gineer, in one of his papers says: IF
one horse can draw load along iron
rails on a level plane 1t will take one
and two-third horses to draw 1t on as
phalt pavement; three and one-third on
the best Belgian pavement; FIVE on the
ordinary pavement. seven on good cob
blestones, 13 on bad cobblestones, 20
on an ordinary earth road and 40 on
a sandy road"
TAxES-A. NJ, City. II for any reason the
holder of a piece Of real estate refuses to nav
taxes what will be the penalty? What is
the law?
It will be sold by the authorities.
This department has not the space to
publish the law, but you may see 1t
in the free library.
YERBA BUENA ISLANDS. R., City. By
what means may ordinary citizen who wishes
to visit Yerba Buena island reach it7
BY rowboat steam launch or govern
ment launch, upon obtaining permits
sion at army headquarters
PIANO., City want to know II IL IL
proper for a young woman who is good pfaniste
TO volunteer selection when visitors call?
If she is good" pianiste 1t would
not be improper to offer to play for
the company.
GOLDEN GATE PARK-P. c. j., city. When
was Golden Gate park laid out1
In 1874.
A DATE Subscriber. woodland On what day
Of the week did August ID, 1888, fall,
Monday.