, 1880-03-06

kuffbllSNLtVlj f1kttt EtfEtlt1u1 ~
far M poatll,lo from the restrictions which
D"Tl1e Sshci'!sions arrived al, briefly stated,
las t,as heen indicated, both the audi
phone ard 'dcntapl,ono depend for thelr &c.
ter upon The principle e. eco''c; 9nr, thia ftns
plates-yib5ate !" unison VIII Tx aS.m soun,
these Instruments the vibrations are Of snfii-
clint forec to BE- audible when conveyed 70
the Internal ear through the medium 9i me
sfst IT, nrdnay a effnna canne pG q
mission beiny direct Iii The autllphone and
indirect through the conducting string in the
"Tha size Of tho sound. receiving, sheet
governs The distance at. which tho tnstru-
nicnts will act, and the dimensions must be
increased IL proportion "A the sos'rGs ,Ss.s o.
fo ors e Is Gsaf ase,ed ne s m s ess ests
phone for use Mt 4 distance, tito latter being
only suited to transmit sounds emitted near
its mouth-pIece. The bowling strings OF
u e s ferer nerec sf' wdrRnp M at n. s II, s4shta
tor.n IL nay Very conveniently be given e
arainnst Il Tic Aei {eeth. NtS NstSs tension, bpt the
proper action, iof. t1,is form is that best
adapted to tmpart tho impact Of sound-waycs
aeafnst It's convex!ty which Is then ex.
pended !n tho form OF thrust OF the aFch
MtNtlios tNu eeIt'4f a1Soo AoA"A'A's "A'@ ~ ''
ao'Fhehta That tSese instruments are of great vsuo
In considerable proportion ot cases 9f deaf
ness there Is no rcason to do,1ht b9t theaa +
their aid the deaf are enabled to heaf.as well
~ those with ordinary hearing. The audi
phone Is open to the-oblect!on TINT during rs
o s1ss M ssr q 1 fSfda e detap"ae ex,S s L Ssi fs
more or lrss in the line of vision. Both
Instruments nre open to the still more serious
objection that they eact require the constant
ssTyce Of Ct least org hand during their usc: e:
hands arc engaged In other employment =,
"..To. remedy. these defects have made Tho
following devIce: A large receiving tlla-
I IHsS e woo sfSesa or msia T. ~ Ths htene rcd
70 BE- held firmly between the teeth, rs pipe
Is held, thus enabling the user to listen i.., to
leaving his hands free for other occupation.
| The diaphragm being below and away from
the fncc, 1t Is c6mrarafiyciy tnconspicnoiie.
fans q nost al a soIs re ey
coatetl with .sllellac and tipped With ivory
fafrly well, though they will prove nnsatis.
forms Of instruments hare been found to
answer tho purpose Of conveying vocal vibr93-
turned out tpto tr,lmpet-shane,, about two
!
n diameter, may DO used for conversation,
tIe dsaf person., snd the opnosit egd i!sld ID
close to the mo.1tl. Of The speaker; r. thh ms
veyed. 4 tense string connecting The upper
teeth Of the two about to converse also an
sWsMrS r. the Snme pnrpose;
when ~ conveyed a r. b By different substances
Where these ore lacking in resonance (as tn
celiuloid and binders, hoard}, fatness IS the
result, while others which are oyer.rcsonant
oantte aud ferrotype mctal) Yield ringing or
that possessed by, good soundlng-boards, of
instantly to tSc onn
tnnance, md also of INSTANTLY ceas-
Of tic caaEative sound. The right
sort Of elasticity Of resonance, that capable
Of reproducing human yOfce-tones IN their
purity, Is possessed to. high degree BY .fut-
treated With sI.c1lac Uar1lIsh and Thoroughly
a1's ss: BfSssa Bs;% 1f s es ste af9 Sf5 asss s
publication ii tie order lei of the soeistys pro:
ceedings, tho discovery OF this application OF
previously discovered and demonstrated at
lhIs meeting the atlaptabi!ity Of thismatcria',
together with other varieties Of paper, ans'
especially Of tllas known as tulle5s ,,is board.
|
four weeks previous 70 the announcement,
through the Associated Press of Jan. 1S, tha.
that discovery Ind been made at tseneya, AID
antctlates any other Ike publication In Amer
"The simp1est osteophone, ono that excc!s
by many times III the volume Of sound trans
m!tteti either audiphonc or denlap',one, con-
sists simply Of ;small rod Of hard wocd.-
convenient slze being. about. two feet long
and quarter Of MI Inch thlck,-one end O1
which Is placed against tho teeth Of the
speaker, the other resting agnlnst or between
tho speaker now artIcuiates in natural tone
Of voice, the vvcnl vibrations Will DO trans
mitted In great volume through the teeth and
hss fS S saEs # @ se deaf M y 9e:osnzed
or arprcctated hitherto, 80 far rs am aware
Is that sensible vibrations, produced BY and
corresponding 70 those Gf the voice, are prsp x
k y as s'q fls!f ss asaasy Sss
throughout Tie skuil wlth ya5yins, deKrees q
Intensity, according to the point 81. OBJ
si5sn ths fsas$sad safssad e e 'fs oa 1ssses se 81
head--wkieh sre specially vibEato.y,, thsst
80 n1 e eG aady es
"a common lead.uencil will nnswer-,one enc
OF which Is pressed aEalnst the part, The,
may also be evidenced as articulate sounds
served, BY its mcans tbs volume Of SOUND
consciously received is pcrctptlble addisloIr
vibrations ACCOUNTS tor the further fact, be
foro mentioned and which have taken muct
palms to verify. that In certain cases Of OK
voies %it rs Utmost % s ds!nctes ~ sve1 w
though speaking In low tones, when ltks
sounds produced in his very ears would b.
totally inaudlhfe, It seems evident, then
clutles among lis leading factors tho bone-vl
bratlons spoken Of; and tho Typographical 70
lations Of the larynx md the vault Of. ths
ph9rynx 70 thnt portion OF tho temporal bout
priori grounds, II ystlrtl were needed, foI
rencEinx the sanio conclusion"
. FKifOxyS, lIYp0pIIOsPIITrHs,