Industrial Noise comes a disability only if defined as such by law This is true of the term "occupational disease" also We may be correct m saying that a loss of function is occupationally in duced, but legally that loss of function need not be an occupational disease What might be classed as an occupational disease or a dis ability m one state will not necessarily be so classed in another Most of the recent problems encountered in establishing equitable compensation laws for noise-induced heanng loss are a result of provisions declaring that occupational dis ease may be compensable Heanng loss un questionably reduces a man's capacity, but if the legal cntena used in many states for establishing disability are applied to noiseinduced heanng loss, it is not legally a dis ability While there is no date of miury or, in most cases, is there a loss of wages, there is no question that heanng loss can be occupa tionally induced Since the late 1940's, courts have fre quently awarded financial compensation for heanng losses even though no specific date of injury could be shown and the claimant had suffered no wage loss, the standard bench marks used since the laws were promulgated dunng the decade between 1910 and 1920 This increased emphasis on social loss caused by heanng impairment has put increased pressure on industry to worry more about conservation of heanng than compensation as a result of its loss The Ear and Hearing Anatomy of the ear The ear is among the most complex of the sensory organs Its dynamic range of re sponse is enormous Sounds so faint they might well have been caused by the Brownian motion of molecules can be heard, and yet man can also hear without distortion sounds that are a million, million times more intense Man also possesses the ability to distinguish some 300,000 tones of different frequency and/or intensity and to analyze complex sounds into their component parts The ear, that mechanism which is capable of such diversity, is a delicate, complicated structure It is divided into three parts the external ear, the middle ear, and the internal (inner) ear (Fig 45-1) The external ear The external ear acts as a conducting channel for sound It is bounded outside by the auricle or pinna, and inside by the external layer of the drumhead or tympanic membrane, and consists of the au ricle and the external auditory canal This canal is about 25 millimeters long and is S-shaped Sound waves traveling down this canal strike the eardrum The middle ear.

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Metals reserve company WASHINGTON, D.

PLAINTIFF'S EXHIBIT September 6, 1945 Paul Cartier, MD.

th* quarterly bulletin rR Metropolitan Nurses Vol. 10, No. 2 jul7f 1946 JUDITH E.

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- 74 The Saranac Laioratory FOR THE STUDY OF TUBERCULOSIS OF THE EDWARD 1_ TRUDEAU FOUNDATION - Saranac Lake, N.Y.

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15 TRANSACTIONS 29th NATIONAL SAFETY CONGRESS GENERAL AND INDUSTRIAL SESSIONS CHICAGO OCTOBER 7-11, 1940 "S EXHIBIT NATIONAL SAFETY COUNCIL, 20 North Wacker Drive, Chicago Copyright, It40, Notional Safaty Council, Inc.

ABSTRACTS FROM CURRENT LITERATURE 221 The simplest kind of protective equipment, goggles, will protect the worker against practically all industrial injuries of the eyes.

TRASKO--state and local agencies IN INDUSTRIAL health 491 LOCAL HEALTH DEPARTMENT PARTICIPATION IN INDUSTRIAL HYGIENE Full time industrial hygiene activities at the local level are not widespread at the present time, although there is a definite movement to bring local health departments more into the picture, particularly in view of the possible passage of federal legisla tion aimed at strengthening local health departments.

86 ROSS A.

596 HEINZ SPECHT holding may result in compression of the lungs to such an extent that onlyiwff considerable difficulty can sufficient positive pressure be created by the thdfaT musculature to release the glottal closure.

348 NOTES TO PAGES 263-68 laboratory that operated until 1948 (ibid., p. 186).