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cnhan,•,•,f by 1,1.111-•ncaIt, ch.n},c:: In the
<br />p11yninlogy of the body, aft In adolened,11ce.)
<br />1f Ir: a fart til t per>:nnc: Ito nolvy
<br />uccupat- Inn . antf w til nol,y avocet logon ore
<br />found genrr'ItIV to have vnrlourr degreee of
<br />prrrnanenl. Sell"Orine111.al hea11111:
<br />Among the pleanure:i having more devaSCat.ing
<br />rnn,equences are ror.k monis, target shooting
<br />and 8not.•rnobi.l.ing. Hearing lass Jue to
<br />gunshot In warfare is very prevalent.
<br />The readings of an ordinary sound -level
<br />meter will fail to indicate the true level
<br />of rnpidl.y peaking sounds because the needle
<br />Of the meter is too sluggish t0 follow the
<br />sharp pressure changes that occur on
<br />impulsive sound, like shots, or even the
<br />sounds of .a poorly -muffled internal
<br />clmbustion engine, which after all, derives
<br />Its power from the explosions confined in
<br />combustion chambers.
<br />akes it
<br />dlfflcult to estimate exposure sto mimpulsive
<br />noises.
<br />HEARING PKO'1'f:C'1•I0N
<br />We are hampered in preventing a great
<br />deal of hearing los, hecau8e of a degree of
<br />bravado thnC causes some People to shun
<br />wearing•hearing protecttion• Since hearing
<br />1089 is subtle and invisible, perhaps it
<br />seems illOglcal to choose a visible means of
<br />protection, Some types of ear protectors
<br />are shown in Fig. 2-4•
<br />5imhle insert-tyPe ear protectors are
<br />u�::tble uhere pc•rh:tp:, 10-20 fill of protection
<br />i:: suffirlc•nt t„ PIIminate the chance of
<br />henrinf' los,. 11, grnernl, these are more
<br />(If fortivr f n r high-frequenr.y sounds Such an
<br />whlStle, Chan for low -frequency sounds such
<br />all m:trhinery nnfsv or Jet turbulence. Cot -
<br />Lon wnrrl In the e. -ors Is not very effective,
<br />only a little hotter than a nothing. However,,
<br />in pinrh, yon can Jcrlve some rc:t.l help
<br />from cotton snaked in easel ne or soft wax
<br />(lo tnrre.ise It..; mars and s
<br />and pre.-'sedcallrtl: Power),
<br />Commcr,'f:tl ear Jiro(octorsln
<br />S(ctthe'•c�def nrmahlc
<br />,in PIAS ASL tYl- provide ,fill bettor
<br />pr/tr,'t Cert• At nl„si you can cc,unt on
<br />internally -worn ear protector, for a 10•-20
<br />fill r•^•furf Inn.
<br />Keal Iv effertive protect loll Is nff,•t,.,l
<br />flynvrt-the-ear un11fc1, whl�h In„1< Ilke n
<br />t•e.latJvc,l)• .1 :1r-f:c' ]'alit' of h,•ndphnnc•::. 'inn
<br />may have .^.ec•n there en the pers•onn, I 1•:nrkln
<br />At ai.rpc,rtn. lr•r mar.imnm protection, both
<br />mufI's and fn,erIS maty be 1.11711. liven fhc
<br />61mbin.tfJnn of muff:; a
<br />not oar protec;
<br />tor•,
<br />12
<br />110wevl•r1 Gln offer I.Ittll` IIIDre flirt 11 411 ilii
<br />Pro' "'I (ern, for sol4lrl can ent,•r the body by
<br />other p:11,112”entering via the the -Rt clvll:y,
<br />the throat, and the bones of the Joeatl. TI'
<br />You translate that Informntlon into the
<br />conditions of your environment, you Cannot
<br />rconaln for jolly lcnf;lh of time: ar•olrnd noon d
<br />levels in excess of 120 dlt without wn.11irlg
<br />yourself. off from the source of -Rounds. Tit
<br />operating noisy machinery, workmen may f.lnd
<br />It necessary to observe and control tilt•
<br />Oparal:ion from the window of an 1-RoJatlon
<br />booth.
<br />If you are conrerned about appearances,
<br />be assured that these are not as obvinnn as
<br />hearing loss, for a hearing loss at high
<br />frequent:tes destroy, the r,::feree that
<br />enahl<'-R Vol, to monitor your Own speak ing.
<br />Not only do you have trouble hearing other
<br />Pelplo, h4,cause vour hearing loss Slurs and
<br />obliterateS tile. consonant Sound:; of speech,
<br />your own speech becomes like what Vol, henr.
<br />flow can you protect your hearing? 7'he
<br />following notes may fit, e
<br />Avoid Situations Where
<br />1• You have to raise your voice to
<br />converse with anyone.
<br />2• Ordinary Melodic music sounds
<br />discordant.
<br />3• You can't manage
<br />telephone. tto talk over he
<br />4. Sharp noises, are repealedIy making,
<br />your ears ring.
<br />loud. S. Everything seems too britlit and too
<br />G. 'file racket makes It c11 ff ti. t to
<br />"think stratght1%
<br />7. You begin to feel ,letached and a
<br />lite v (fizzy.
<br />fl - in a short whLle you begin to feel
<br />tired and dazed.
<br />9• The noise makes you feel Seasick.
<br />Your ]fearing May 11;lVe Itcgun To I)cfot'.InraCr
<br />When it Seems Thal.
<br />1• Yon have troul,le r'ecns.:nlzlnf; what
<br />Is snt.l from the Stage or polish.
<br />You have to ask ,et„Ir to
<br />what. Ihey say. 1 1 r,y,ent
<br />a• People ark Volt to
<br />airy.
<br />t'c•prnl: 1; hat Voll
<br />4 • 1'eu to ,c` t he f hr earl nl rmly, r :at Inn
<br />al the dinner table.
<br />5• The hlyds :;ee,n to hav,, Slul,pc cl
<br />singing.
<br />f • 1•c,u miss the Lele_phone bell or 1:11c
<br />doorhe 1.1 .
<br />. 0
<br />
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