The mirror., 1923-05-31
QUERIES
NOTICE TO INMATES

For the benefit of any inmates who appre-
ciate and see the opportunity that their spare
through correspondence school courses. study Of
good literature, acquiring an education in our
Night Schools. or. who need helpful informa-
icus departments, will herewith be privileged
to use the "Query" column. You are welcome
to send in any queries OF serious interest TO
ton of Miss Miriam E. Carey, Supervisor 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,
register number and lock number to all queries
submitted for publication. Inmates Names Of
course, will not be published. only the initials
ON figuring Horsepower of an inter-
Lal combustion engine, what relation has
a "piston foot" to one revolution? For
instance: 4 cylinder engine, 4M inch bore,
inch stroke, develops 225 horsepower at
1000 piston feet How many revolutions
per minute is it turning over?-R. w.
O:-An engine having inch stroke
would have piston travel of inches in
one revolution. If it had a piston travel
of 1000 feet per minute, it .woud also
have a piston travel of 10000 inches per
minute. This divided by the inches per
revolution would give the revolution per
minute of the engine, thus: 1000 times IL
divided by times 2 equals $4,000 RPM.
R. T. Craigo, DunaOoody Institute.
O:-Please state how to find the cubic
inch piston displacements of automobile
engine for 4, g., 8 and ~ cylinder mo-
tors.--H. H. w.
A:-Multiply length of stroke by area
of cylinder; this will give piston Misplace
ment in cubic inches for one cylinder.
For any number of cylinders multiply ac-
cordingly.
Q:(a) What is the greatest angle of
elevation of the sun from the equator?
What day is it to the North? To the South?
(b) "a" claims that motor driven gyro-
scope suspended and directed at the sun
will continue so throughout Earth's rota-
ton. 'B' claims it won't vary from posi-
ton placed in with regard to earth's sur
face Which is right Pc. D.
A: (a) % degrees, 80 minutes. June
21st. December 21st. (b) "B" is right,
for it will not vary from position placed
in with regard to earth's surface. "A
body in motion cannot change the plane
III which it is rotating any more than it
can diverge from a straight line if it has
only motion of translation" The state
ment Of "As" claim is rather ambiguous,
and interpreted in one way, his contention
is right, l. e. that a gyroscope suspended
and directed at the sun Cor any other
point) will continue so directed, but it
does not follow that it will continue so
directed t01vard the SIM or particular
point, # that point does not remain sta
tionary. For instance, let it be directed
at the sun at noon, or practically perpen-
dicular to the earth's surface. AT mid
night it's perpendicularity would still be
maintained, but not by any means could
it be directed at the sun then.
Industrial Dept, Y. S. p, Leapenworth.
NOT1CE-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 on
request The International Text Books are
especially complete in their information on
technical subjects. Consult the Reference, Use
mi Arts, Literature Chemistry. Biography and
Science divisions of our library catalogue for
diversified subjects