The National tribune., 1898-04-14
Answers. Second series.)


81 A point in the circumference of
circle revolving on plane Will describe
figure called The cyclod.-Wm. Haspham
4 point in the circumference of whee
| rolling on a plane describes q cycloid
whose a xis is equal to the diameter of tn
wheel, and base equal to the circumference
of wheei.-Asa w. Slayton.
| g.. Where a circle is revolving abOu
another circle with the circumferences il
contact a point in the perimeter of tn
| revolving circle will describe what il
termed an epicyclo VIM Haspham.
50. The use of such geometrcal figures
in practical mechanics is that the cycloio
| curve is used in determining the length
of penduums and ve.ocities of heavy
bodies descending toward the earth'S cen
| ter. One queer law: in any inverted cy-
cloid curve Il ball will roll from any point in
the curve to the bottom in equal times, and
will roll up opposite side to same hight
If no friction or atmospheric resistance
perpetual motion.-Asa w. Slayton.
In practical mechanics such figures are
Iapplied to machinery to adjuS properly it's
movements / take it.-Wm. Haspham
Ga. The Amazon River does not flow to-
ward the equator in more than one-half OF
/ its course. Gravity causes water to seek
a level. The Mississippi River flows to-
ward the equator because Of the sOutherly
| slope of the Great Central Plain.-F. l..
| Burdick
1.-The cause of these rivers or any
others flowing in the directions they do is
the circumstance. | think, of their sources
being more elevated above sea-level than
their mouths. Liquids, when free to flow,
naturally seek the sea level, whether they
flow north, south, east, or west. Water
poured on a plank, with one end at sea-
level and the other above it, will always
| run in the direction Of the end at sea-evel,
be that direction north, south, east west,
or any other. regardless OF the centripital or
centrifugal force, and we think the same
principle holds in the case of streams
VIM. Hasrham.
BY gravity alone the Mississippi would
flow north, hence it is centrifugal force that
determines its present flow The Amazon
flowing parallel to the equator, centrifugal
force only makes its waters lighter retard
ing their flow; inertia would cause them
to flow westward; hence, it must he gravity
alone which causes the eastward flow in
spite OF the other two fOrceS.-ASa W. Stay
ton.
%. spectrum is the properly arranged
colorS-red, orange yellow, green blue
indigo and violet-produced by separating
a sunbeam into its elementary colorS by
the use OF a prism. Asa w. Slayton.
n spectrum is the image of something
seen, continuing after the eyes are closed
or tarned away. Also, it is the figure formed
by Il beam OF light received through a small
hole or slit and refracted by being passed
through a priSm-Wm. Haspham.
60. Diamagnetism is a form or condition
OF magnetism which causes certain sub
stances freely suspended to take u sition
at right angles to the lines of magnetic
force.-F. l.. Burdick.
\ bar OF iron suspended between the
poles of horseshoe magnet takes the d-
rection OF the line Joining the pales; a bar
oi bismuth or phosphorus takes a direction
at right angles to the same line. itodies
acting like the iron are called magnetic; all
acting AS the bisnluth diamaGnetic. Far
aday discovered in 1875 that all substances
are one or the other, more or lesS.-Asa W.
Siayton.
1857. The male grasshopper, it is said, has
Il spot on the end Of his wing covers by
the rubbing together OF which he produces
"A noise. He also produces a noise some
tunes by destroying crOpS.-Wm. HaSphanl. |
BY rubbing the elbows OF their wing
covers or their bases together over their
backs; or ng the veins of the inner
part Of the wings together; or by rubbing
the inside of the hind legs at the ankle |
Joint against the outside of the wing covers;
or by rubbing the upper surface of the |
front edge OF the wings against the under |
surface OF the wing covers. The last method |
only can be used while 1yng.-Asa W. |
Slayton.
coated with metal, as tin foil, pasted out
side and In bottom and all to with n one |
or two inches OF top, cover OF wood, gen
orally, an upright wire through cover, with
metal ball (knOb) on top, and metal chain
from lower end resting inside on the bottom.
Asa w. Slayton. When charged with cleo
tricity it is used in a variety OF experiments.
F. l.. Burdick.
3D. There is no such thing as aluminium !
Alu minium or aluminium is made by fusing
in reverberatory furnace 100 parts of an
artificial double chloride of aluminium and