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Noise levels in a clinical chemistry laboratory
moderate progression of hearing loss 2.4.217 (58014) Griffiths, P.D., KeU, R.L. and Taylor, W. as exposure increased from 0 to 30 years, and then only at three and four Noise levels in a clinical chemistry kHz. Furthermore, the average laboratory temporary threshold shift produced by Journal o f Clinical Pathology, 1970, a typical day's work (Monday evening 23.5, 445; abstr, in Bio-Medical vs Monday morning) was only 5 dB. Engineering Describes inVestigation into the noise levels in a clinical chemistry laboratory. It was shown that although the levels were insufficient to cause damage to hearing, t h e y exceeded the criteria o f acceptability for offices and workshops.
2.4.220 (58029)
Anon
abstr, in Scientific Reports on
Noise suppression measures in a Swedish Industrial Hygiene and Occupational Diseases in Czechoslovakia paper factory (In Swedish)
Description, accompanied b y diagrams, of noise-suppression measures Hearing and noise in industry HMSO, London, 1970, 241pp; abstr, in applied to a large paper machine (working width, 9m; web speed up to Occupational Safety and Health 1000 m/min). The machine r o o m is Abstracts provided with a sound-absorbing false ceiling and has been so designed that Report on an investigation undertaken the thermal insulation also serves as jointly by the Medical Research Council sound insulation. Adjoining offices and the National Physical L a b o r a t o r y have been sound-insulated with a 5 cmin the United Kingdom, between 1963 thick layer o f mineral wool. In the case and 1968. Chapters are devoted to: of the suction and press rolls, models background and terms of reference; producing little noise have been organisation of the joint working group adopted. The dryer has been entirely appointed (planning, p o p u l a t i o n enclosed and the result of this has been selection, etc); data acquisition to maintain noise in the machine (selection of factories, pre-selection of r o o m at a level which dispenses with subjects, otological examinations, the need for ear protectors to be used. audiometry, noise exposure, recording of data); results (retrospective, serial and prospective studies, t e m p o r a r y 2.4.221 (58030) threshold shift studies,pathological Berka, I. cases); discussion of results (general The possibilities o f decreasing noise in relationship between noise and weaving mills (In Czech) hearing, practical aspects of audiometry, Zivotne Prostredi6, 1969, 3.4, 196-199; assessment of susceptibility to abstr, in Scientific Reports on occupational hearing loss, interpretation Industrial Hygiene and Occupational of audiograms, methods of restricting Diseases in Czechoslovakia noise exposure). A new concept, 'noise immission level', is advanced; the direct The known technical provisions product of the duration and the sound against noise cannot be as yet applied intensity is a characteristic measure of to the full extent in weaving mills. noise exposure. However, some success has been achieved. The p r o t o t y p e of the gripper loom Novostav has such parameters that its noise level, when in operation, 2.4.219 (58023) does not exceed the m a x i m u m Fesier, W., Hauf, R. and Heuft, U. permissible value of the noise class N 85. Noise measurement and hearing surveys A t t e m p t s to decrease the noise level in in the woodworking industries (In classical shuttle looms by different German) modifications of machine mechanisms A rbeitsmedizin-So zialmedizinwere mostly n o t carried out on a Arbeitshygiene, 1968, 3, 38-43; abstr. scientific basis and partial improvement in Journal o f Occupational Medicine did not yield expected results. By covering the shuttle loom Picanol the Extensive measurements made in 11 extension of noise into the wood-working industries showed that environment o f the machine was the median noise level was about 98 dBA, significantly limited. Global efficiency or well above the 90 dBA limit however, can be verified only after generally accepted as the maximum the model is used in practice. Other permissible for lifelong exposure for technical measures to decrease the 8 hr/day; indeed 89% of the levels noise b y reflection from surrounding exceeded 90 dBA. Yet a hearing survey surfaces are also, as yet, in a state of of 88 workers indicated only very isolated experiments.
Burns, W. and Robinson, D.W.
2.4.222 (58033)
Jesensky, J. and Vanzura, Z. Hygiene problems of forestry workers in the production of t i m b e r with a view to the risk of vibrations (In Czech) Prakticky Lekar, 1969, 49.4 148-159;
Arbetsmil]o, 1970, 2, 27-28; abstr, in Occupational Safety and Health A b stra cts 2.4.218 (58022)
Vibration
The number of diseases due to vibrations increased in forestry workers using m o t o r saws in Slovakia from 1.6 cases in 1963 to 24 cases in 1967 (per 1000 workers). By measurements of the saws used ( S t i h l - e o n t r a 08) it was confirmed that the levels of acceleration permitted b y Czechoslovakian hygiene regulations were exceeded and that the use o f antivibration handles which reduce the acceleration levels by 2 up to 8 dB was not sufficient particularly since their damping effect manifests itself only in higher frequencies. The hygienic regimen of forestry workers was also studied ( p r o t e c t i o n a g a i n s t cold, observing time limits in work with m o t o r saws, etc) and several shortcomings were found. The authors consider it necessary to revise the o u t p u t standards and to check the bonus system for cutting of wood, and to introduce such an organisation of work which will make it possible to observe rules and regulations of labour protection.
2.4 223 (58036)
Tartakobskaja, L. Ja. and Gorodnova, N.V. The effects of/ vibration on the b o d y during the dressing of ingots (In Russian)
Gigiena Truda i Professional'nye Zabolevanija, February 1970, 14.2, 12-14; abstr, in Occupational Safety and Health Abstracts Workers engaged in the dressing of ingots, removing surface faults with pneumatic hammers, are exposed to vibration, noise and high temperatures. Whereas workers dressing castings receive most vibration in the right hand and arm, since they usually hold the hammer in the right hand, in the case of fettlers, vibrations are also transmitted to the lower leg, knee joint and sometimes the shoulder. Medical examinations of 130 fettlers disclosed that vibration damage in t h e m was manifested b y vegetative polyneuritis of the arms and legs, only rarely accompanied by angiospasms. The authors also investigated functional changes in fettlers in relation to vibration sickness.
Applied Ergonomics December 1971
247
2.4.220 (58029)
Anon
abstr, in Scientific Reports on
Noise suppression measures in a Swedish Industrial Hygiene and Occupational Diseases in Czechoslovakia paper factory (In Swedish)
Description, accompanied b y diagrams, of noise-suppression measures Hearing and noise in industry HMSO, London, 1970, 241pp; abstr, in applied to a large paper machine (working width, 9m; web speed up to Occupational Safety and Health 1000 m/min). The machine r o o m is Abstracts provided with a sound-absorbing false ceiling and has been so designed that Report on an investigation undertaken the thermal insulation also serves as jointly by the Medical Research Council sound insulation. Adjoining offices and the National Physical L a b o r a t o r y have been sound-insulated with a 5 cmin the United Kingdom, between 1963 thick layer o f mineral wool. In the case and 1968. Chapters are devoted to: of the suction and press rolls, models background and terms of reference; producing little noise have been organisation of the joint working group adopted. The dryer has been entirely appointed (planning, p o p u l a t i o n enclosed and the result of this has been selection, etc); data acquisition to maintain noise in the machine (selection of factories, pre-selection of r o o m at a level which dispenses with subjects, otological examinations, the need for ear protectors to be used. audiometry, noise exposure, recording of data); results (retrospective, serial and prospective studies, t e m p o r a r y 2.4.221 (58030) threshold shift studies,pathological Berka, I. cases); discussion of results (general The possibilities o f decreasing noise in relationship between noise and weaving mills (In Czech) hearing, practical aspects of audiometry, Zivotne Prostredi6, 1969, 3.4, 196-199; assessment of susceptibility to abstr, in Scientific Reports on occupational hearing loss, interpretation Industrial Hygiene and Occupational of audiograms, methods of restricting Diseases in Czechoslovakia noise exposure). A new concept, 'noise immission level', is advanced; the direct The known technical provisions product of the duration and the sound against noise cannot be as yet applied intensity is a characteristic measure of to the full extent in weaving mills. noise exposure. However, some success has been achieved. The p r o t o t y p e of the gripper loom Novostav has such parameters that its noise level, when in operation, 2.4.219 (58023) does not exceed the m a x i m u m Fesier, W., Hauf, R. and Heuft, U. permissible value of the noise class N 85. Noise measurement and hearing surveys A t t e m p t s to decrease the noise level in in the woodworking industries (In classical shuttle looms by different German) modifications of machine mechanisms A rbeitsmedizin-So zialmedizinwere mostly n o t carried out on a Arbeitshygiene, 1968, 3, 38-43; abstr. scientific basis and partial improvement in Journal o f Occupational Medicine did not yield expected results. By covering the shuttle loom Picanol the Extensive measurements made in 11 extension of noise into the wood-working industries showed that environment o f the machine was the median noise level was about 98 dBA, significantly limited. Global efficiency or well above the 90 dBA limit however, can be verified only after generally accepted as the maximum the model is used in practice. Other permissible for lifelong exposure for technical measures to decrease the 8 hr/day; indeed 89% of the levels noise b y reflection from surrounding exceeded 90 dBA. Yet a hearing survey surfaces are also, as yet, in a state of of 88 workers indicated only very isolated experiments.
Burns, W. and Robinson, D.W.
2.4.222 (58033)
Jesensky, J. and Vanzura, Z. Hygiene problems of forestry workers in the production of t i m b e r with a view to the risk of vibrations (In Czech) Prakticky Lekar, 1969, 49.4 148-159;
Arbetsmil]o, 1970, 2, 27-28; abstr, in Occupational Safety and Health A b stra cts 2.4.218 (58022)
Vibration
The number of diseases due to vibrations increased in forestry workers using m o t o r saws in Slovakia from 1.6 cases in 1963 to 24 cases in 1967 (per 1000 workers). By measurements of the saws used ( S t i h l - e o n t r a 08) it was confirmed that the levels of acceleration permitted b y Czechoslovakian hygiene regulations were exceeded and that the use o f antivibration handles which reduce the acceleration levels by 2 up to 8 dB was not sufficient particularly since their damping effect manifests itself only in higher frequencies. The hygienic regimen of forestry workers was also studied ( p r o t e c t i o n a g a i n s t cold, observing time limits in work with m o t o r saws, etc) and several shortcomings were found. The authors consider it necessary to revise the o u t p u t standards and to check the bonus system for cutting of wood, and to introduce such an organisation of work which will make it possible to observe rules and regulations of labour protection.
2.4 223 (58036)
Tartakobskaja, L. Ja. and Gorodnova, N.V. The effects of/ vibration on the b o d y during the dressing of ingots (In Russian)
Gigiena Truda i Professional'nye Zabolevanija, February 1970, 14.2, 12-14; abstr, in Occupational Safety and Health Abstracts Workers engaged in the dressing of ingots, removing surface faults with pneumatic hammers, are exposed to vibration, noise and high temperatures. Whereas workers dressing castings receive most vibration in the right hand and arm, since they usually hold the hammer in the right hand, in the case of fettlers, vibrations are also transmitted to the lower leg, knee joint and sometimes the shoulder. Medical examinations of 130 fettlers disclosed that vibration damage in t h e m was manifested b y vegetative polyneuritis of the arms and legs, only rarely accompanied by angiospasms. The authors also investigated functional changes in fettlers in relation to vibration sickness.
Applied Ergonomics December 1971
247