The Appeal., 1902-11-08
So. 40 PER YEAR.

upon It rnen the raster rne aeroplane
flies the less the power required to keep
& It supported If. however, tits to carry
anything with it-and it must carry its
- ,.sinee les and its E,cssd- then tbs
power required to overcome the resis-
tance of the air will increase as the
cube Of the speed, as in the case of a
eamship driven through the water I
may here explain that while the sresls-
tance in pounds varies only as the square
OF the speed, yet the engine power is
measured by the product of the speed
into the resistance, and this produces the
cube. Thus to double the speed of a
steamer we must multiply the horse
power of her engines by eight and in
crease her daily consumption Of coal in
the same proportion. In the meantime,
since she. completes her. voyage in half
the time the total consumption for the
trip will only be multiplied by four 30
1T follows from this that the speed we
can secure has a practical limit imposed
by the very nature of the case. But we
nave some compensation in the fact that
the horizontal motion which is to sus-
tain us. in the air need not be that of the
whole m a chine, but may equally wen be
that OF the wings of horizontal wind
mill. Get the wings at the proper angle,
then apply power sufficient to make
them turn fast enough and up we CO.
Give a very slight inclination to the axis
of rotation of the wings and we shall
soar forward. Altogether, from an ideal
standpoint, the flying machine seems
quite within our reach. But before we
can reach out and grasp it we must go
through a complicated course of calcu-
latlon based upon strength and weight Of
materials, poWer-of engines, heat Of COM
bustion and laws of aerial resistance
Until we make this calculation we are
lrcN NO obi
ting q ladder up to the moon seemed SO
simple that he cried to have it DONE
Both the laws and the facts go. erE;ns
the case compl cte1y worked out by
experiment and we'll understood Tho
inventor has only to bring these laws
and facts to his aid to save himself a
great deal of time and money which
might otherwise be expended in making
machines that could not fly. Let hin
put his machine on paper, giving ma
terial and dimensions Of every part,
then call in the aid Of the expert physi-
cist. The latter can determine in ad-
vance what lifting power the machine
will have. Ii this prove equal to the
weight of the machine plus that of the
man Who can guide it the problem Is
solved. If this power is found TO be only
a. little greater than the weight Of the
machine we shall have something that
Twill fly, but will not be of any use.
III Illlo way llle SuDJect may De Dfoug1l
very largely within the range of nlath-
|ematical demonstration. What can
say of the ultimate outcome? On the
affirmative side only this: That no one
has yet demonstrated the absonta izn-
possibility Of accomplishing the desired
feat. What is certain is that no one
Twill ever fly to any great height OF to
any considerable distance until some
msstal-.or alloy is discovered which will
comDlne strength with lightness in q
lar hlgher degree than any metal or al,
10y at pres 7nt known to u.s.. There are,
II lilllllailons' TOO, at every turn upon what,
machine can do. The speed with which:
rotating apparatus of any sort can
turn mas its limit The larger it's size
the fewer turns it can make in a second
Let us consider the central axis as at:
rest. Then the extreme speed of the,
outer circumference, as it turns, : can.
never exceed few hundred feet a sec
ond without the centrifugal force endan-
eer1ng the machine. Just how MANY
hIndred feet will depend upon the skin
OF the inventor in combining his ma
terlais, put II he ever approa ches a speed
OF 1000 feet second his whirligig, what
ever ne makes 1t of, Will fly to pieces by
its own, centrifugal force. This is 4
torce which admits Of no evasion OF COM
promise.
Again, the best possible machine Will
require certain horse power and the
quantity of: coal or petroleum required to-
produce this horse power be deter
mined.
We are also met at every point bv the
law that, while the weight Of the ma
chlne increases as the cube Of it's di,nen-
SONS, the power which it can generate.
VIII increase only the SOU are. It is
curious how the later law of increase
extends to every detail, strength Of boiler
steam producing capacity and centyifugal
tcrce.: 1t fellows that the smaller our
machine the greater the fraction OF it's
own weight which it can possibly carry
ana, make 1t as effective as We plcase.
there will be 4 limit its sz-. beyond
which it cannot carry more than its own $
weight" ] has, been sugg stei to the.
writer that by making number of small .
machines combination may be effected
which would have an advantage over any
single machine that c5uld be cJnst,IcteG
This iGca is a very Interesting one, w.sicIl>-
SOME inventor may a1nuso himself in car
lyiHS out. Bat. grant :y all reasonable
ho!es, it must be admit i that The PROS
poet CT eve: having Tying N chine
which shall GlDtTscGe our present meth
obs CT transportation does 70. seem at all
e:?cuil1,; g nG.-W'ashingten star
Il Etis.- 1nccnsa.tcnt.