The sun. [volume] (New York [N.Y.]) 1833-1916, 1897-01-31

which eomplicate and confuse the dIacnos,, II
they are not clearly differentiated. and 10 q.
| this tho stethoecopo was but too frequently I'm.
equal. Besides, IL was large. clumsy. AID
unwieldy, and the doctors were glad 81
the prospect OF replacing Il by a NOR,
efficient instrument. But the more con'e'va-
p.oie's'on rosaruea thent7
..,oo 1000 ~ ,,r. ~, ..n,,o. -
.s'oo ooe 0uuo' 1 : eau.Ioh "oun a.
grounds than those on which thew based Il. IL,
,n.,,,m.,, -, -, .S-a
q new standard OF aural diagnosis. 1t de,ec,si
sounds with ultra .microphonic power: bu, 10
worry e.c.Ilenc. wa. II. undoiur. Each coils.
dIagnostician. and pcrvadinr every tran.m...
them. was the tingling or ringing of the metaloi
u'ssn u "a msae' IN ue"sS'
'''He . 'natoi aa'sta"t 'o'ee "
Ing 10 make itself heard In storm OF wind
u.,.,,.a 49,. 49, - -. w."
pson. Aae,S. "a'en no cameo 'htsmph
great deal of clandeatine in orm.,ion was a.
cnr.a nv hsnn.r,-on =, ,.nman -, -,
around telegraph ofices. who listened TO ;hs
.ounders and sonetime. s,o,. x.,p,b,. nav,
The applian CO patented was designed to de'es,
such attempts. It masnincd the click OF tho
sounder. but conveyed every particls o. tie
sounu 10 the ear OF the operator. The ArnAii''
could be adjusted SO close TO the magnet thai
.e .. ope.a'ou 'ou'1 ~
seen on the closest inspection. and yet ne
gave to the operator With perfect clear.
ness the dots and dashes OF the Morse
vice took loss than half a. much cnrreat |
as the ordinary method, and thus saved over
SO per cent. In battery power. But in 1855 Tho
for supplying current to the Instrument. iusttad
Of batteries, and the amplipbOne was laid on II.
need of q thoroughly practical and etNclen,
substitute for the stethoscope thi. instrlmcti
The results appear to DO conclusive. The resur.
rected sound mAgniher which the dynamo
ousted from II. nI.t sphere OF usrfulnc'; h:
stieetiys snTsi d ni"a m nsGn ia@ yet k u O. %' .
without the slightest trace Of foreisn yibrA.
tons, and where there is a comminsl,as o.
The instrument. which in appearance is Al
first sight strongly suggestive or a boy. metal
phrarn.s of two and n half INC inches In drhgaetef.
The metal. which Is extremely thin. il corfu.
gated n circular lines. like the ripPles mad, b,
diaphragms Is placed n brass ring, abuu; a ouS'-
ter VI an inch wide, into grooves in which ;hs
edges Of tho diaphragms are spun or pressed.
An air chamber 10 thus left between the .Hner
convolutions OF tho diAphragms, prOirciiEE
from the upper diaphragm is n meta, S'Hd, |
eouered with hard rubber. for convenience "a
handling. Through this stud passes a tube ons
carries the sound waves TO the ear, as tn The
photograph. THIS tube runs down To the All |
cham her between the two dInphrnyms. ~ he
centre of the opposite diaphragm il ATTACHED . +
bell. terminal, through which u iUhs
rims to the outer surface OF the diaphragm.
This cup-shaped terminal Is applied 20 no
surface nearest to the locality from which he I
sound Ia supposed To emanate. An r,ten'toa
piece il prov ided to facilitate the haul,rg u
the terminal IN certain eases by the prtr'IioH.
err. The whole appliance weighs about two
ounces and can be carried in tbs pocErt.
Among the sounds which this iu,irgment
enables the physician to hear plainly ARE; Tie
action OF tho respiratory organs, the cirru,Rtoa
of the blood, the movement OF the decisive
organs in health md in disease. the -ouuts /
made by the muscles. Joints and bour.. tie