ear defender

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Related to ear defender: Hearing protection
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Ear Defender


a means of personal protection from the harmful effects of noise; such devices fall under the classification of protective clothing and equipment. Two types of ear defenders are distinguished: the internal type, which is inserted into the outer ear canal, and the external type, which covers the entire outer ear. Internal ear defenders are plugs made of special fabric, extremely fine glass wool, ordinary cotton wadding and gauze, rubber, or plastic. External ear defenders may be in the form of a helmet liner, used to protect aviators’ hearing, or protective cups, similar in appearance to headphones, consisting of two shells or cups linked to one another. The shells are made of several layers of sound-absorbing materials, such as thick felt, cardboard, rubber, or vinyl chloride, with fillers between them, such as oakum or slag wool.

The use of ear defenders reduces the effective noise level at least 20-30 decibels. The noise spectrum is also less harmful because high-frequency sounds are attenuated.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

ear defender

ear defenderclick for a larger image
Any device, such as an earplug or an earmuff, used to protect the human ear from loud noises, like that of jet engines, that may damage hearing. Combined earplugs and earmuffs provide the maximum ear protection. Another combination of helmet and neoprene earplugs is equally effective. The illustration indicates the maximum attenuation level of some of the protection devices.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Sarah Broadbent, Technical Services Engineer for the 3M Personal Safety Division, explained: "The protection level and versatility of our new Peltor brand LiteCom Headsets mean these ear defenders are suitable for a number of industries.
Kevin said: "We have bought him ear defenders and we'll be coming prepared.
And in the corner, a tormented mother, tested by her toddlers'tantrums tries, unsuccessfully to tame a tide of noise while our ear defenders stand without so much as a look as I walk, regretfully, to return to my book.
These include: making available ear defenders for those who find the experience too loud; use of large-print scripts/summaries; introduction to the cafe furniture that is easier for sight-impaired people to see and autism- and dementiafriendly training for staff.
A pair of ear defenders have also been poignantly left on a lamppost which has been covered with bouquets of flowers.
JSP reports that under the new PPE Regulation-and with hearing protection moving to Category III-companies and officers of companies face the prospect of fines if helmet mounted ear defenders have not been properly accredited to the relevant helmet in use.
The Welcoming Autistic People guide provides tourism businesses with tips and practical advice including the provision of visual stories, quiet spaces, ear defenders and sensory backpacks to help autistic people and their families prepare for and enjoy a visit.
ZOO "Visitors will hear them as they walk up the hill and our bird keepers will have to wear ear defenders when they are inside with them."
Although they weren't ear defenders they still drown out noise.
Northern Safety Supplies Ltd does workwear from hard hats, safety boots, clothing and ear defenders to 'working at height' equipment.
Warwick Crown Court heard that the 15-year-old boy was "seconds away" from opening fire - after loading two cartridges into the gun and putting in ear defenders - but instead dialled 999.