Theatre Design & Technology - Fall 1984 - 30

RENT

INTERCOMS &

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EXTRA SPECIALS IN OUR 1984 CATALOGUE
140 PRODUCT LINES FOR THE PROFESSIONAL

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continued from page 14 ...

edge-grain fir floating on a concrete
slab. Vibrations are thus limited to the
shop floor only, with transmissions inhibited to the rest of the building structure, particularly through columns,
beams, pipes and similar sound carriers. This wooden floor is laid on
sleepers isolated from the building support structure by construction grade
neoprene shims which absorb vibrations in the floor. Given a shop with a
hard, non-absorbent floor such as
poured concrete, machinery noise can
still be isolated by building heavy,
wooden pallet -Ii ke bases set on neoprene pads which absorb vibration and
thus reduce the level of sound which
will be transmitted,
'Within the realm of personal hearing protection, there are a variety of de\'ice on the market. most of which are
designed to attenuate ambient noise to
safe level . A the loudest le\'el most
scene shop machinery attains is typicall; around 110 dBA, a hearing protector capable of 20 dB attenuation is
usually adequate. Hearing protection
devices fall into three general categories:
ear muffs, ear plugs and disposable ear
down. The ear muff, as its name des2l\

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cribes, is a cup-like device which covers
the entire outer ear, and screens out
most noise. While the frequency range
of individual muffs will vary as will
their degree of attenuation, ear muffs
are best suited for very high noise levels
and short wearing duration. The use of
muffs may well be equated to the use of
a face shield, useful for a particularly
dangerous task such as grinding or
routing, but awkward to wear all day.
Their cost ranges from about SID to S30
per pair with the price usually increasing
in relation to the degree of protection.
The ear plug is not as effective as the
muff but may be designed to attenuate
specific frequencies. Jet engine mechanics and other flight line personnel
wear ear plugs because they permit
audibility of conversation but limit
high frequency engine noise. Ear plugs
may be \'ery effective for certain power
tool noise. but they are not as secure as
ear muffs. They are les expensi\'e than
muffs. and easy to carry and store.
They are also easy to lose.
Disposable ear down is a fibrous insulating material rolled into a plug and
fitted 111 the ear by the user much the
way one stuffs cotton in the car for medicinal purposes. But unlike collon.

Thcalrl' tk,ign & Technolog) CSITT rail 19X.J

ear down has excellent noise-limiting
properties permitting dangerous high
frequencies to be attenuated while allowing general conversation, music and
other normal sounds to be heard. It is
also very sanitary as it is a one-use item,
not likely to be passed around among
workers. Ear down is inexpensive, averaging less than ten cents per worker
per day thus making its usage economical for occasional shop visitors as well
a regular employees.
Ear down and certain styles of ear
plugs are comfortable enough to be
worn all day without discomfort once
the initial habit of wearing them is established. Most ear protection suppliers recommend gradual application.
While ear plugs and ear down are
comfortable and secure for most ambient noise conditions in the scene shop,
certain procedures such as metal cutting, high speed router work and similar operations may dictate the wearing
of ear muffs temporarily over ear plugs.
However, as attenuation values are not
fully cumulative, an ear plug with 20 dB
attenuation worn under an ear muff
with 35 dB attenuation will not produce
55 dB attenuation but a value somewhat lower than the combined reduction of both devices.
Hearing protection and noise control are necessary elements of a conscientious safety program. Required by
law in industry, it is still hard to convince workers that it is necessary. In
regard to the working conditions in
scene shops as compared to industrial
manufacturing plants, the danger of
exposure to sustained high noise levels
is substantially less. However, the liability of loud machinery still exists.
Educators, technical director and supen'isors concerned wi th t hei I' own
good health as well as the health of their
tudents and co-workers should consider programs of hearing protection
and noise control. \\'hether enforceable
through government agencies or not.
Hearing loss due to prolonged exposure to loud noise is a slo\\' bu t relentless deterioration. It cannot be
cured once begun. It can, however, be
limited so that those \\'ho have suffered
partial auditory damage may protect the
hearing capabilities they ha\'e left.
0, Andrew Gibbs is i\lanaging Director
of the University Theatre. Universit~ of
ArI,ansas at Fayetteville. and a practicing theatre consuhan;.



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
Theatre Design & Technology - Fall 1984 - 6
Theatre Design & Technology - Fall 1984 - 7
Theatre Design & Technology - Fall 1984 - 8
Theatre Design & Technology - Fall 1984 - 9
Theatre Design & Technology - Fall 1984 - 10
Theatre Design & Technology - Fall 1984 - 11
Theatre Design & Technology - Fall 1984 - 12
Theatre Design & Technology - Fall 1984 - 13
Theatre Design & Technology - Fall 1984 - 14
Theatre Design & Technology - Fall 1984 - 15
Theatre Design & Technology - Fall 1984 - 16
Theatre Design & Technology - Fall 1984 - 17
Theatre Design & Technology - Fall 1984 - 18
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Theatre Design & Technology - Fall 1984 - 24
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Theatre Design & Technology - Fall 1984 - 26
Theatre Design & Technology - Fall 1984 - 27
Theatre Design & Technology - Fall 1984 - 28
Theatre Design & Technology - Fall 1984 - 29
Theatre Design & Technology - Fall 1984 - 30
Theatre Design & Technology - Fall 1984 - 31
Theatre Design & Technology - Fall 1984 - 32
Theatre Design & Technology - Fall 1984 - 33
Theatre Design & Technology - Fall 1984 - 34
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Theatre Design & Technology - Fall 1984 - 37
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Theatre Design & Technology - Fall 1984 - 44
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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