The mirror. (Stillwater, Minn.) 1894-1925, 1918-01-03


course will not be published only initials Of each querst
being used. (Ed.)
OILS there any difference the Spectator and the
Sir Roger de Covery papesl M E.
A-Roger de Coverly papers the name applied to a
series of sketches in which Sir Roger Coe
character These appeared in Spectator magazine of
which Joseph Addison the animating spirit.
Q:-What is meant by the pressure of the rs-C. D.
Alt the force weight of the air on every
point with which is The globe earth is sur
rounded by layer of air about so miles thick and like every
other substance the weight hence presses
upon every object with which it is in contact.
OILS interior of the earth composed of solid rock?
A-Scientsts believe the crust the materials
of which the earth composed temperature
melting point of bodies surface AS the melting
point increases with the PRESSURE however, believed that the
materials the of the earth maintained in
solid state owing the tremendous pressure prevails
Q:-In rough mountainous country land is surveyed in
straight lines which hills and through guches
Area is figured by multiplying length tract by
breadth, where land is level Is actually
than such survey shows and possible to ascertain
the exact area? o. w.
A:Actua surface of is greater than number of
rods and resulting from the product length by
breadth of tract crooked line connecting points
longer than a straight line connecting same two points,
1t possible by of careful surveys and mathematical
computations ascertain accurately
ordinary practical this would whe such
made in measuring land ordinary
o-Is graphite used anywhere for ubricang valves
cylinders, and how and with what ls used on
superheater engines? l. H.
Ayes, graphite used for purpose and is fed from
cup auxiliary lubricant Where they claim
so saving in valve OIL and also say should
fail food &ho
graphite will protect the cylinders against scoring
There other claims made for it. One is that it
especially suited conditions attending use of super
heated of its resistance influence
extreme heat.
O:-What is steams Err
AIN the dictionary, steam is defined as ''the elastic
aerorm fluid into which converted when heated
boiling point, or, in other words changed by
of heat into 1t the fluid which
the of kettle boiling
The visible cloud which escapes from boiling
in the form of mist the mouth of exhaust pipe of
engine 1t is rather small particles of
into which has condensed through with cold
True invisible observe the mouth of
kettle the exhausppe of engine from which know
escaping AT every temperature there formed from
its surface vapor of which the clouds formed all
of the year. This change vapo evap
Grafton of takes place low temperatures only
surface however. But heat vessel temper
of 212 Fahrenheit then the particles of the of
dying heated surface the esseD changed in
and rises the surface i'm bubbles, which is the
phenomenon call boiling.
Q-Have the laws of the gyroscope ever been explained if
what heyf 2 Is there railway line from Mexico City,
Mexico through Central America South American g. What
equivalent United money yen, Japaneea
j. ].
Ats action is based the principle
in rotation about its principal axis of inertia of least
applied the direction of the axis will remain
disk, loaded the rim and revolving panebe made
rapidly about its axis of greatest of inertia,
and it be freely supported Tin gmbas like the box of
rotation lasts 1t will therefore, constantly point the
and be employed show that the apparent rotation
of the about the earth due real rotation of the earth
itself in the opposite direction This application made by
Foucaut in 1882 who his gyoscoPe in rotation and then
with telescope observed the change in the plane its
rotation caused by the movement of the EARTH
The singular phenomena shown by gyroscope
these depending the composition of rotations Any motion
body which has point fixed is of of rotation
passing through that point Hence simultaneous
any axes being of
kind equivalent rotation about a single axis The
effect them of mpesng upon the frame in which the of
gyroscope is suspended tendency about
axis give whole instrument rotation about inter-
mediate axs and this will coincide nearly with that of
the gyroscope itself, the greater the of its rotation.
2. No. 8. $0498
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