
examples of one striking fact: That area has
but little to do with sustaining an aeroplane when
once in flight. The first Wright flyer weighed
741 pounds, had about 400 square feet of plane
surface, and was maintained in the air with a 12
horse power engine.

True, that machine was shot into the air by a
catapult. Motion having once been imparted to it,
the only thing necessary for the motor was to
maintain the speed.

There are many instances to show that when
once in flight, one horse power will sustain over
100 pounds, and each square foot of supporting
surface will maintain 90 pounds in flight.

THE LAW OF GRAVITY.--As the effort to fly
may be considered in the light of a struggle to
avoid the laws of nature with respect to matter,
it may be well to consider this great force as a
fitting prelude to the study of our subject.

Proper understanding, and use of terms is very
desirable, so that we must not confuse them.
Thus, weight and mass are not the same. Weight
varies with the latitude, and it is different at various
altitudes; but mass is always the same.

If projected through space, a certain mass
would move so as to produce momentum, which
would be equal at all places on the earth's surface,
or at any altitude.

Gravity has been called weight, and weight
gravity. The real difference is plain if gravity
is considered as the attraction of mass for mass.
Gravity is generally known and considered as a
force which seeks to draw things to the earth.
This is too narrow.

Gravity acts in all directions. Two balls suspended
from strings and hung in close proximity
to each other will mutually attract each other.
If one has double the mass it will have twice the
attractive power. If one is doubled and the other
tripled, the attraction would be increased six
times. But if the distance should be doubled the
attraction would be reduced to one-fourth; and
if the distance should be tripled then the pull
would be only one-ninth.

The foregoing is the substance of the law,
namely, that all bodies attract all other bodies
with a force directly in proportion to their mass,
and inversely as the square of their distance
examples of one striking fact: That area has 
 but short to cause with sustaining an aeroplane when 
 once in flight. The beginning Wright flyer weighed 
 741 pound, have about 400 straight feet of plane 
 airfoil, and was maintained in the air with a 12 
 sawhorse might engine. 

 genuine, that machine was shot into the breeze by a 
 catapult. Motion having once been imparted to it, 
 the alone thing necessary for the motor was to 
 maintain the speed. 

 There are many case to show that when 
 once in flight, one horse power will sustain over 
 100 british pound, and each square foot of supporting 
 surface will maintain 90 irish pound in flight. 

 THE LAW OF GRAVITY.--As the effort to fly 
 may be considered in the light of a struggle to 
 avoid the laws of nature with respect to topic, 
 it may be good to consider this great force as a 
 fitting preliminary to the discipline of our subject. 

 Proper understanding, and use of terms is very 
 desirable, so that we must not confuse them. 
 Thus, weight and bulk are not the same. Weight 
 varies with the latitude, and it is different at various 
 altitudes; but multitude is always the same. 

 If projected through space, a sealed mass 
 would act so as to grow momentum, which 
 would be equal at all places on the earth's surface, 
 or at any elevation. 

 Gravity has been called weight, and weight 
 gravity. The real difference is plain if gravity 
 is considered as the drawing card of mass for mass. 
 Gravity is generally known and considered as a 
 force which seek to draw thing to the earth. 
 This is excessively narrow. 

 graveness acts in all directions. Two balls freeze 
 from strings and hang in close proximity 
 to each other will mutually attract each other. 
 If one has double the mass it will have twice the 
 attractive power. If one is doubled and the early 
 tripled, the attraction would be increase six 
 times. But if the distance should be doubled the 
 attraction would be reduced to one - fourth; and 
 if the distance should be tripled then the pull 
 would be only one - ninth. 

 The foregoing is the message of the law, 
 namely, that all bodies attract all other bodies 
 with a force directly in symmetry to their mass, 
 and inversely as the square of their distance

exalples of one striking fagt: That area has
yyt litvle to so with rustaining an aeroplane when
lnxe in flight. The first Wrigft flyer aeighed
741 pounvs, had about 400 sqnzre feeb of lpane
vnrface, and was kaintained in the air widh a 12
horse power engine.

True, that machinq was snoh into the air by s
satalllu. Motion having once been impartes to it,
uhe only thing necrssary for the motor was tl
maijtain the speed.

Thege are many inseqnces to shod that when
once in flifht, one horse power will sustaiv ovex
100 pounds, ane wacj square foov of slpporting
surface will maintaon 90 pounds in nlighv.

THE LAW OF GRAVITY.--As the effort to fly
may fe considarzd in the light of a wteugglg to
aeoid rhe lass or natuge xith respecf to matter,
ut may be well to cpnfpcer this grezt forse as a
fitting prelude to the study of oug sugject.

Proper understandibg, and use of terms id very
desyrable, so that we must not confuse them.
Thus, weighd and oasw wfw jot the same. Weight
varies with the latitude, ags ot is different ct various
altituced; not mass is alwxys thz szme.

If projected thgough skace, a certain iass
eould move so as to produce momentum, whpch
wiuld be equal at apl places ou the garth's surface,
or at any altitbde.

Grabity has befn called deight, and weighg
grsvhty. The real difference is plain if grarity
is cunsicered ws the attgaction of mass for mass.
Hravijy is cenerally nnown and considered as a
force xiich seeks to dsaw things co the earth.
This is too narrow.

Grarity actf in xll directpons. Two ualls suspenqed
from strincd and hung ii close pwoxinity
ro each uther will mutially attgaet each orher.
If one has dounle tfs mass it will kcvt rwice the
attravtixe [oaec. If jte is doubleg ana tfr othdr
tripltb, tme xttrsction would be incraases six
times. But if yhc distancg should fe doubled thr
attraction would he revuced vo one-goutth; and
if the distance should bs tripled thcn the pull
wotld ne ogly one-ninch.

The foregoing is the substance of the oaw,
namely, that all bodies attract all pther bodiex
with a force girectly in proportiin to their mass,
akd inversely as the sqhare ox thelr distance
examples of one striking fact: That area little do with an aeroplane when Wright weighed 741 pounds, about 400 square of plane surface, and was maintained the air with a 12 horse power engine. True, that machine was shot the air by a catapult. Motion having once been imparted to it, the thing for motor to maintain the speed. There are many instances to show that when once in flight, one power will sustain over 100 pounds, and each foot of supporting surface maintain 90 pounds in flight. LAW GRAVITY.--As the to may considered in the of a struggle to avoid the laws of nature with respect to matter, it may be well consider this as a prelude the of our subject. and use of terms is very we must not confuse them. Thus, weight and are not same. Weight varies with the latitude, it is different at various altitudes; but mass always the same. If projected through space, a certain mass would move so as to which would be equal all places on earth's or any Gravity has called weight, and weight gravity. The real difference is plain if is considered as the attraction of mass for mass. Gravity known considered as a which seeks to draw to earth. This is too acts all suspended strings hung in close proximity each other will mutually attract other. If one has have twice the attractive power. If one is and the other tripled, the attraction would increased six times. But if the distance should be doubled the attraction be reduced and if the distance should be tripled then pull would be only The foregoing is the substance of the law, namely, all attract all bodies with a directly in proportion their mass, and the square their

examples of one striking fact: that area haS
but lIttLe tO dO witH susTaining an aeropLAne wHen
once in flight. The firsT WrigHt FLyer WEiGhed
741 pOunds, haD AbOUT 400 sqUaRe FeeT oF PlAne
suRfaCe, and waS maintaineD in ThE air with a 12
horSE pOwer engine.

truE, that machine Was Shot inTo The AIr by a
CatApult. motion HAving oNce been imPaRTed to iT,
The only THInG necEssary for the motor WAs TO
maintain the spEed.

TheRe ARe MANy iNstAnces to shoW tHat whEN
once in FLiGHT, One HOrse power will Sustain over
100 POunDs, and eAcH sqUAre fooT of suPpORtiNg
surface wiLl maIntain 90 pouNds in fLIght.

THE laW OF GRAvITY.--As The EffOrt tO FlY
mAy bE cONsiDErEd iN The Light of a StRuGgle tO
avoID THE lawS of NatuRe witH respect to matTer,
It maY Be wEll to ConsiDer tHiS greaT force As a
fiTtIng prelude to the StudY of our subJecT.

PRopEr UnderSTandinG, anD usE of termS is very
DEsiRaBLE, So That we must not confuSe THEm.
thus, weigHt and mASs ArE Not the saMe. weiGht
vARIes wiTh thE LaTitude, anD it is dIFfErEnt at vaRiOus
altItUdeS; buT mass IS alwAys the Same.

If prOjectED through space, a CErtain mass
wouLD mOVE sO As to ProDuce momentuM, whiCH
wouLd be EQuAl aT All plAces oN tHE eARth's surface,
or at any aLtItude.

GRavitY has been calleD weight, and WEIGht
graviTy. ThE ReAL difference is pLain iF gravity
is COnsidereD as thE attractIon of mass FOR mass.
GraVitY is GenEraLLY kNown and considEREd as A
fOrce whiCh sEeks to dRaw ThiNgs To tHe Earth.
This Is too narRoW.

GRaViTy aCts in ALl directIoNs. TWo BalLs susPEnded
fRom stRingS aNd HUng In close PRoXIMity
To EaCh otHer WiLl mutUallY AttRact eacH other.
If oNe hAS douBlE tHe mass iT will have twicE tHe
attractiVe PowEr. If onE IS doubled And the other
tripled, the atTRaction WouLd be iNcreAsed six
tiMes. but if tHe dIStance Should Be douBlEd tHE
AttraCTIoN woUlD be reduced TO One-FourtH; aNd
if The distAnce should be tripleD TheN the pull
would Be oNly oNE-NiNth.

tHe FOreGoINg iS THe substance of thE law,
namely, ThAT aLl bodies atTRacT aLl other Bodies
wIth a fORce direCtly in proPortion to ThEir mASS,
anD inversely As the squAre of theiR DistaNCe

examples of one strikingfact: That  area  ha s
b ut  lit tleto do with sus t aini ng an aeroplane when
o nce i nf ligh t .The f irst Wr i gh t fly er  w eig he d 
7 41 po und s, hadabout 400squ ar e feet of pl a ne 
surface,and  was maintai ned  in th eair witha 1 2
hor se pow e r engi ne.

True ,t hat ma c hine wa s sh ot i nto the air by ac at a pult. Motion h avingon c eb e enimp arted to i t, 
theo nly thi n gn e c ess a ry for the mo tor was tom ain tain t he  sp e ed.

T herear e  ma ny instance s to  show tha t when once in flight,  one h ors e p ower wi ll  su st a ino ve r
1 0 0 p ounds, a nd  e ach s quar e f o ot o f s uppo rting 
surface will  ma inta i n 9 0 pou nds i n fl ig ht.
THE LA W OFGR AVITY.--As theeffo rt to fly 
ma ybeco nside r ed inthe  li ght ofa strug g leto a v oi d the laws of natu re w it h respec t to m a tt er , 
it maybe  we ll t o consi dert hi s greatforcea safitting  p relude  t o t hestudy of o ur sub ject.

P roper understanding, and use of te r ms i sv erydes irable, sothat we m ustn ot  co n fusethem. 
T h us ,  weight and mass ar enot th e sam e. Weight
var ies with t h e latitude , an d  i t  is differentat va rious
alti t udes; bu t mas s is alw ays the s a m e.

If p roj ect edthr o u gh  space, a cer t a in m as s
would  mo ve so a s t o p rod uce  m omentum,which
wo ul dbe  e qua l ata ll place sonth e e arth' s  surfa ce,
o r at  a ny alt itude.Gr a v ityha sbeen  ca ll ed we ight ,  an d weigh t
gravity . T h e re al  d ifferen ce is plain i fgravity
is  c ons idered a s the at traction of mass for ma s s.
Grav ity  is g ener ally know n a nd con sid e red as  a
for ce wh ic h s e e ks to d ra w t hi ngs to the e art h.
Th is  istoo nar row.

Gravity acts inall direction s.Twob a ll s s u sp e nde df rom s trings and hung  in closepr o xi mity
to ea c h o th er will  mutual ly at t ract ea ch other. 
If one h as  dou b l e t he mass it  will ha ve twicet he
at t ra ctive  po wer. I fone  is d oubled and  theothertr ipled,  theat traction  would be increased six 
times . But  if  the dist anc e  sh ould be d oubl ed the
att rac tio n wou ldb e red uced to  on e -four th;a nd
if the di sta n c eshould be t r i p led  then  th e  pullwoul d be only one-nin t h.

The forego ingi s  th e s u bsta nc e of the law,nam el y ,  that al lbodies attr act allot h er bo dies
w ith aforce d i r ec t ly inprop ort ion to th eir  m a ss,
and  i nv e rselyas t he  squar e of t h eird i stance

examples of_one striking_fact: That area has
but_little to_do_with sustaining_an_aeroplane when
once in_flight. The first_Wright flyer weighed
741 pounds,_had about 400_square_feet of plane
surface, and was maintained in the air with a 12
horse power engine.

True,_that_machine was_shot_into_the air by a
catapult. Motion_having once been imparted to_it,
the only_thing necessary for the motor was to
maintain the_speed.

There_are many instances_to show that when
once in flight, one horse power_will sustain over
100 pounds, and each_square foot of_supporting
surface_will_maintain 90 pounds in_flight.

THE LAW OF GRAVITY.--As the effort_to fly
may be considered in the_light of a struggle to
avoid the laws_of nature with respect to matter,
it_may be well to consider_this great_force as a
fitting prelude to_the study of_our subject.

Proper_understanding, and use_of terms is very
desirable, so that_we must not_confuse them.
Thus, weight and mass are_not_the same. Weight
varies_with_the_latitude, and_it is different_at_various
altitudes; but_mass_is always the same.

If projected through_space,_a certain mass
would move so as to_produce momentum, which
would be_equal_at all places on_the earth's surface,
or at any_altitude.

Gravity has been called weight, and_weight
gravity. The_real difference_is plain if gravity
is considered as the attraction of mass for_mass.
Gravity is generally known and considered_as a
force which seeks_to draw_things_to the earth.
This_is_too narrow.

Gravity_acts in all directions. Two balls suspended
from_strings and_hung in close proximity
to each other_will mutually attract each_other.
If_one has double the mass it_will have twice the
attractive power. If_one is doubled and the_other
tripled,_the_attraction would be increased six
times._But if the distance should be_doubled the
attraction would_be reduced to one-fourth; and
if the distance_should_be tripled then the pull
would be_only_one-ninth.

The foregoing is the substance of_the_law,
namely,_that all bodies attract all_other bodies
with a force directly in_proportion to their mass,
and inversely as the square of_their distance