Document ppw3XK3aR2ox5Xq71DoYD5LKE

! eace baa shown that such practioe is unwarranted,. I In Brakeblok, compounds of lead formate, oxide, and sulphide ed as powders in various formulae. In Bamapo Chicago there is a brass casting machining operation .e of .producing an exposure to lead dust. In American Forge, lead tempering baths are used in the die ig department, Lead dross from .these baths could be a hazard. iese - Amsco and national Bearing affected. | Acute intoxication is almost unknown and chronic poisoning, a lisabling and serious condition, is rather infrequent industry-wide, established cases fail to respond to treatment. In founding, manganese is usually assooiated with the production oganeae. steel eastings and manganese bronze. The maximal allowable atratibn lla 6.0 milligram, per cubic meter of air. This value is s exoeedeid in the foundry industry even in the case where no exhaust lation is; provided, - All divisions are concerned. Occupational loss of hearing from industrial noise la now nized as 'a definite disease entity and is already condensable in States. There are insufficient data available in the field to ca shed noisp levels in the various frequencies or octave bands above isdairmept of hearing will result. To make the problem more complicated, it is difficult if not sible.to distinguish the amount of loss of hearing due to presbycound that due to aooustical trauma. Sound measurements made in typloal foundries show noise levels jess of 100 decibels even in the frequency wave lengths from 2000 - per second end up. While there is no conclusive proof that this >f exposure is harmful, many investigators are of the opinion that Measurements already made, show that tumbling mills, shake outs, '.ng and' chipping jobs, electric arc furnaces, air cylinders, and gas ladle heaters and furnaces are the principal sources of noise in -vundry. I Pre-employment audiograms will measure a Job applicant's hearing old. Periodic audiograms will show Whether there is any lose of gtaking iplane. The amount of loss due. to oncoming old age and that. --wyotijon would need to be evaluated by an otologist. Prevention and control of industrial noise is difficult and rvices of an engineer who has specialized in the problem is usually ary in oijder to obtain an attenuation worth the oost involved. - BrakebjLok, Electro Alloys, and National Bearing. I 30 i i i ! SPNY 000160