Theatre Design & Technology - Fall 1984 - 15

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Figure 3. Slight noise damage: speech area largely intact.

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Figure 4. Severe noise damage: speech inteligibility impaired.

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Figure 5. Advanced noise damage.

60

produces permanent damage to the
ear's hearing cells.
The Environmental Protection
Agency (EPA) and the Occupational
Safety and Health Act (OSHA) embrace the issues of hearing protection,
and are sources of both information
and regulation for private industry.
While most theatre shops are not speci fically regulated by the EPA or
OSHA, supervising institutions are often under government regulation and
specific safety rules may be imposed
following the federal guidelines .
The federal regulatory agencies require that industries under their purview evaluate noise levels regularly,
monitoring both sound levels and duration, The chart below describes permissable daily noise exposures according to
the Walsh-Healy Act of 1969, recently
revised.
Duration Per Day,
Hours

8
6
4
3
2
I Yl
I
Yl
V4 or less

Sound Level
dBA
85
90
95

97
100
102
105
110
115

Typical scene shops sustain occasional noise levels in the range of 90108 dB when more than one power tool
is in use. While no scene shop uses its
tools steadily, as, for example, a commercial furniture factory, the potential
for hearing deterioration exists.
Continued exposure to dangerous
level of noise causes deterioration of
the cells within the human hearing
mechanism that translates sounds to
the brain, As these cells deteriorate it
becomes more difficult for the brain to
interpret specific sounds, leading to the
inability to hear certain frequenciesusually the higher ones-and e\'entually the inability to hear in the speech
intelligibility range. During the deterioration process, often over many years,
there is a progressive loss of ability to
differentiate ounds in a noisy em-ironment, forcing people to ask for repetition of the spoken word, louder warning bells. and so forth. Individual tolerance to noise varies enough so that it
is difficult to establish a universal point
at which deterioration of the nen e cells
occurs_ However, all ears are suscepLJ. ITT I-all 19 '4 Theatre

De,i~n

&. Technolog)

13



Table of Contents for the Digital Edition of Theatre Design & Technology - Fall 1984

Contents
Theatre Design & Technology - Fall 1984 - 1
Theatre Design & Technology - Fall 1984 - 2
Theatre Design & Technology - Fall 1984 - 3
Theatre Design & Technology - Fall 1984 - Contents
Theatre Design & Technology - Fall 1984 - 5
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Theatre Design & Technology - Fall 1984 - 42
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Theatre Design & Technology - Fall 1984 - 44
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http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967May
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1967Feb
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Dec
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Oct
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966May
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1966Feb
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Dec
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965Oct
http://www.nxtbook.com/nxtbooks/hickmanbrady/tdt_1965May
http://www.nxtbookMEDIA.com