The mirror., 1921-02-10
QUERIES
NOTICE TO INMATES


For the benefit Of any inmates who appre.
ciate and see the opportunity that their spare
hours give toward a means OF self education
through correspondent school courses study OF
Night Schools, or, who need helpful informa-
tion in connection with their work in our var.
ious departments, will herewith be privileged
come to send in any queries Of serious interest
to yourself, THE MIRROR with the kind col.
laboration of Miss Miriam E. Carey, Super
visor Of Institutional Libraries, will gladly
endeavor to supply the requested information.
NOTICE-In order to regulate the conduct
OF this column inmates must sign their name.
submitted for publication. Inmates names, Of
course, will not be published, only the initials
of each querist being used.-Editor.
OILS it true that magnetism will pene-
trate all substances, and is there any way
of insulating against it?-W. P.
Ave are assured by an authority
that magnetism penetrates nearly all SUBJ
stances with the same ease as it passes
through the air. Iron, steel and few
other metals it penetrates with more ease
than it penetrates air. 1t is evident from
this statement that magnetism cannot be
kept out of substances by ordinary insula-
tion as electricity can be. The only way
of insulating a substance from magnetism
is to provide an easier path for the magne-
tism. This is done by surrounding this
substance by iron, since as we said above,
magnetism penetrates iron more easily
than it does most substances An iron
box will screen its contents from magne-
tism. The iron should be at least half an
inch thick for the best protection.
Q-Can white paint be made by mix
ing the other colors together, and if so
what are the proportions?- ?-S. w.
Alt can't be done. White light is
theoretically mixture of all the colors
OF the spectrum-but this presumes that
those colors are pure. Colors such as we
have in paints are not pure; they are all
more or less mixture already. When
such colors are mixed together they pro-
duce gray color-in other words the
white is darkened by impurities. You
can take the seven primary colors of the
spectrum as produced by passing white
light through prism, and combine them
again to produce white light-but this
can't be done with pigments, as they all
contain some gray.
Odd the aborigines of America pos
sess horses or cattle when the Europeans
first came in contact with them 20. N.
A:-No, both horses and cattle were in
troduced into America from Europe. The
nearest thing the Indians had to cattle
was the buffalo.
Q-Can you advise me concerning the
royal northwest mounted police of Can
ada ?-S. H.
A:-This body was organized in 1873
by Canadian government to preserve law
and order in the wilderness northwest of
Lake Superior. To join the police a man
must be between ages of % and 40 years
and be sound in health and of good
character. He must also be able to read
and write either the English or French
language and to both ride well and under
stand the management and care of horses.
Headquarters of the mounted police is at
Regina, Saskatchewan, Canada.
O-What is the meaning of the word
displacement" when used in connection
with vessels PM. w.
A:-The term displacement means that
the weight of the ship is determined by
the amount of water displaced by it.
NOTICE-All inmates using the Query Col.
umn and desiring more detailed information to
their queries are invited to use the splendid
reference books in our library to be. had
request. The International Text Books are
techinal subjects. Consult the Reference, Use
full Arts Literature, Chemistry Biography and
Science divisions of our library catalogue for
diversified subjects.