By J. E. Moore F.R.I.B.A. (auth.)

ISBN-10: 0333242939

ISBN-13: 9780333242933

ISBN-10: 1349160350

ISBN-13: 9781349160358

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These vibrations are amplified and transmitted across the middle ear by a mechanical linkage of small bones called, by reason of their shape, the hammer, anvil and stirrup. The cavity of the middle ear contains air maintained at atmospheric pressure by periodic connection to the mouth and nose during the act of swallowing. The base of the 'stirrup' seals one of two 'windows' into the inner ear or cochlea. Its vibrations are thus transmitted along the fluid contained within this spiral cavity. Dividing the cavity of the cochlea along almost its entire length is a complex partition of bone and membrane to which some 25 000 nerve endings are attached.

Experiments to assess changes in working efficiency due to changes in acoustic conditions are very difficult to confirm under actual working conditions because of the impossibility of entirely excluding other factors which may affect the result. It has been discovered, for example, that sound-absorbent treatment of a workshop has on occasion improved efficiency, not because noise was reduced, but because the morale of the workers was raised by the interest taken in their welfare. Because of this, there is some disagreement between the results of the many experiments carried out along these lines in industry.

Generally, high-frequency, harsh or unmusical sounds, sounds of fluctuating pitch or unpredictable rhythm cause most annoyance. It is with the above in mind that the criteria employed for practical purposes of noise control must be judged. Such criteria are suggested in section 3. Most of them are based on a statistical analysis of public opinion and do not take account of minorities who for one reason or other may react 'abnormally'. Effect of Noise on Learning The effect of noise on education is obvious where interference with the understanding of verbal instruction results.

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Design for Good Acoustics and Noise Control by J. E. Moore F.R.I.B.A. (auth.)


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