The mirror., 1921-07-28
QUERIES
NOTICE TO INMATES

For the benefit of any inmates who appre-
ciste and see the opportunity that their spare
hours give toward means of self education
through correspondent school courses, study of
good literature, acquiring an education in our
Night Schools, or, who need helpful informa-
ton in connection with witt their work in our var;
to use the Query" column. You are well
come to send in any. queries of serious interest
to yourself, THE MIRROR with the kind col
laboration of Miss Miriam E. Cary, Super
visor of Institutional Libraries, will gladly
endeavor to supply the requested information.
NOTICE-In order to regulate the conduct
register number and lock number to all queries
submitted for publication. Inmates names, of
course, will not be published, only the initials
of each querist being used.-Editor.
OILS there any truth in the theory
that ship will sink to depth of 1000
feet and then float between the surface
and the bottom of the ocean p P. o.
A-Anything sinks in water when it
weighs more than the same volume of
water weighs. A cubic foot of fresh water
weighs ga pounds. Anything which
weighs more than this per cubic foot will
sink in fresh water. The density of sea
water differs somewhat in different oceans
and seas. 1t may be taken at about 1.O3.
At this figure, a cubic foot of sea water
would weigh about 64.27 pounds. Any
thing heavier than that per cubic foot will
sink in sea water. Another most impor-
tant factor is that water like all liquids
is nearly incompressible. So incompressi-
BILE is it that at the bottom of the deepest
ocean, six miles below the surface the
water is only 20 per cent heavier than at
the surface, and cubic foot of sea water
at the bottom only weighs more than that
per cubic foot will sink to the very bot
tom of the ocean in its known place.
Aluminium, the light metal, weighs 1865
pounds per cubic foot; iron weighs 450 to
4SO pounds per cubic foot, and stone
weighs from 135 to 200 pounds per cubic
foot. Of course they all go to the bottom
anywhere when placed in water. There
is widespread impression that the tre-
mendous pressure deep in the ocean will
prevent sinking, but pressure has nothing
to do with the case.
OIL would like to know why we wear
heels on our shoes Pc. D. S.
A:-Because the sandal-like footgear of
olden times was not adapted to horseback
riding, and when the hi gh boots were in
troduced heels were put on for the pur-
PoSC VI giving Tic lOOl d SOOQ HOlQ OH
the stirrup.
ON view of the recent canonization
of Joan of Arc, will you kindly tell me
the meaning of the name Joan ?-L. P.
A:-The name of Joan is an English
contraction of Johanna, which is Hebrew
name, meaning "Grace of the Lord"
Johanna, Hannah and Anne all belong to
the same family, being derived from
"Iah" Ia contraction of Jehovahr and
"chaanach" ("favor"). Joan's French
name, you remember, was Jeanne dare.
NOTICE-All inmates using the Query Cof-
umn and desiring more detailed information to
their queries are invited to use the splendid
reference books in our library to be had on
request. The International Text Books are,
especially complete in their information on
techinal subjects Consult the Reference Use
full Arts, Literature, Chemistry, Biography and
Science divisions of our library catalogue for
diversified subjects.