New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1878-03-25

sound il transmitted TO the brain This curious part of
the ear is very complicated in structure but VIC snail pc
enabled in moment to see the principal hit whee o
sound is supposed TO be received lIustiauns o th
screenl There is the drum membrane lg,dHr II 'is
q little membrane ATTACHED TO Dony strnf e. ,
tached to lie hammer bo.e We can hear tone which
cOusists Of sixteen vibrations N second we , v ~,
tone which consists OF about 10000 vlb.auonsi Out
wien we get below about forty vibrations there PRO
duced what would called an unpleasant sellHu'ion
which is more noise than musical tom On the o';et
shrill scream. Music then CONSISTS o. from 40 70 VVy
bIt the complete compass of the ear h from about 10 10
40 600 These little strings arranged In the ear are ca
rHne then Of giving Us this long variation. and not only
n but %3 9wG cne Take ' for aae what
called full tone or whole tone toohnS KEY on lhe
nrpapl Now the next 1DtCrVai of whole tone Il thls
[strling III; ana bali tone very different you sce
Lea part of one Of these whole tones or ia2 oil nan oug
In the these bres tuned thar the fibre Wnich
ensiiy Nov, in order to appreciate the nanner when
these lbres Sitraiehow 1t IL mat the SOUND IS con
Quoted from the membrane into the carve VIII maze
o little experiment.
PROOF THAT VIBRATIONS ARE TRANSMITTED.
have here tunnsfork and in front Of The lantern is
another. These tuned that the tones are In per-
oc npison NcaI tho top of Of The tunng-lcks Is
nte bail suspended ny afilamen Now If we project
shadow this latter upon the and sound the
other CHARACTERIZATION is fifteen feet distant
yen will he enabled that the vibrations Of that
uuneork The one shown on the screen will throw the
ball away from it, There is the physiology VI it, Ilustat
ing IT by the actual experiment, in which the screen
showed the bali violently ag'tacd, and repealed from
the distant iOrki Now those lille strings WieN are
tuned in unison must vihfate when sound Is produced
% exactly the same fundamental note.
There IL Just point before SO 10 the mCchan
i'm 1.-THE voice ana that Is the combination Of sounds
pleasant 30 the and those unpleasant. sound Tor
example two tuning forks. Doing sol Those tones
are pleasant, bu. Il have t.C Intervals too close
lsOundiDg tbc forks GgRnl There f. something which We
don't like Ia hear; and can illustrate that very read
lily again by taxing low tone where tie vibrations ar
deep. Striking low NOTES on The orguD.
Those, YOU see not pleasant, and u
You listen yOu will there Is an interval
Of silence which occurs when those two sounds "
Now. let us explain. Turning 20 the blacbbOadI il1e
have from this point ON the blackboard 10 TN, Iont
q OF sound suppose that thl> wave starts al Tie
time aV ing anOi her that one does, bat moves
little faster, IL will make an excursion 10 this point
ILLUSTRATING and then one wave VIII be going ~ ""
direction and The other VIII be Roing IN IN opposite
direction, and when they are Just IN an oitpa-
site position they ncutrlZc each other and 40
5Ound results. However, rs they ias, donE tHoy sc'
mo he same phase as IL IS ct IL ana me hlle' o tdt
and then have iuenslncdtian OF tHc tohri
and aud by bringing these TWO tones "u % unison
and sounding them Together, We have beating inlloh
which unpleasant 70 TIE ear AM tais Us known hs
dssOuce or disCord. Where there is no chance, how"
ever, TO gOoN or auC ther, nave TIC s"Uu
called c0Hsbn2ucc NcgOrG There le NO reason WHY
tins Should bc except tnat IL L} stuogcdi "ti We
Etudy The manner IL which various computations
produced ~ combining thc tcH-''au images Oh
tie vibrations OF tHc FORKS WIN tdch othtr.