00000nam 2200000zi 4500 9.952173 CaOODSP 20250811144958 m o d f cr |n||||||||| 250610e197708##oncd ob f|0| 0 eng d CaOODSP eng rda CaOODSP n-cn--- D68-25/8-1977E-PDF Forshaw, S. E., author. Listening for machinery malfunctions in noise while wearing ear muffs / S.E. Forshaw. Downsview, Ontarrio : Behavioural Division, Defence Civil Institute of Environmental Medicine, Department of National Defence, Canada, August, 1977. 1 online resource (v, 13, [11] pages) : charts. text txt rdacontent computer c rdamedia online resource cr rdacarrier DCIEM technical report ; No. 77X43 Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references. "It is generally believed by personnel who work in ships' engine and boiler rooms that the noise attenuation provided by an effective ear muff will adversely affect their ability to detect those sounds that indicate real or potential machinery malfunction. Studies conducted with persons listening to speech or pure tones in noise suggest, however, that for normal-hearing persons in noise levels above 80 dB, ear muffs are probably not detrimental to the above listening task"--Abstract, page v. Personal protective equipment. Earmuffs. Ships Noise. Vêtements de protection. Couvre-oreilles. Navires Bruit. Defence and Civil Institute of Environmental Medicine (Canada), issuing body. Canada. Department of National Defence, issuing body. DCIEM technical report ; No. 77X43. (CaOODSP)9.943618 PDF 735 KB https://publications.gc.ca/collections/collection_2025/rddc-drdc/D68-25-8-1977-eng.pdf