The Interior Department's Federal Water Quality Admini stration officials have named the Ethyl Corporation (producer et gasoline lead additives) its the leading polluter with lead.

PCB is the latest addition to a growing list of chemi cals, generated tor toe bene Scripps, observes that with' [lead, tbe chlorinated hydro carbons. and crude oil, "man; the effects of lead accumula tion to ocean food chains," Dr.

-bout Dutch Boy red lead?

On the other hand, only one sample contains more than one milligram of lead, a fact which indicates, tentatively at least, that the exposure to lead dusts to this group of men has been slight to moderate in magnitude.

However think I am in position to give you at least a tentative solution of your problem without resorting to the method of em ploying tetraethyl lead in pteh tests, I may say that it is not advisablej, in my opinion* to use this material in patch tests without considerable caution, but I may also tell you that tetraethyl lead is not a skin Irritant and that in our experience, in cases of this type, it has regularly given negative results, " ' I am sending you herewith an article written on this subject by one of my associates in the laboratory.

note that only a few remit* to be done so that lb is possible at present bo give a brief analysts of the siboatton* Let is call your attention to the fact that v q have not yet received the pads frets the respirators, and feliat the results on these will he of considerable importance since they will show the exposure frost a some what different angle* We should have the results on these before our data are complete and entirely satisfactory* By way of preliminary orientation, let a point out that the normal figures for lead Ij &v a man figure of about (*2) mgs* per sample of faeces, bub that the normal figure sometime goes as high as (*} mgs* I think we are safe in arbitrarily setting the level of normality her at such a figure that any amount above <*5) sign* may b regarded as a significant and definite lead exposure* The urines of normal individuals rarely run In excess of {#0o) Any figure of (*10) or over is, therefore, definitely above the normal range* tm to arsenic, the con centrations In normal individuals, in our experience, rarely exceed (*0&)siga so that If we set (*1) as the proper level of normal, we shall have a fairly satisfactory criterion* It Is Quite apparent from the results that there Is a significant exposure to lead in fch Insecticide plant and in the 2ino Oxide plant* Judging from the observations which I made in both'of these plants, the use of respiretore has materially reduced the hasards* I am somewhat surprised to find that respirators are as effective as the figures indicate* Despite the respirators, however* It Is apparent from fch fa .cal figures that a fair proportion of the men ar expound to eonsiderabX amounts of lead* It la also apparent from the distribution of high findings in the urine that a number of the men have been aboorbing lead in significant amounts .'

Lead Industries Association, Inc.

The laboratory report, as you have called It, has recognized that stippling is not necessarily indicative of lead absorption and that in many Instances it has nothing to do with lead.

National Lead Company WESTERN REGION P.0.

Hansvre* < There Is ennloaed Do. 1 to the April 22nd revision of tbs Progm for Obtaining Strategic aad Critical Material* for tbs Fiscal Tear I9$k* TMs amendment icereasea tbs axthorised precarsaagt of nickel, amoalte aabatai, aad feathers aad down; Halts tbs quantity of raw silk that aay be purchased during tbs period Hareh 1 to June $Q, lS$h$ atd .authorises tbs procurement of lead ad sice la accord ance with the ay long-tens atoefcnile galicTV Tbs revisions in the pro- eurecent progress for nickel, silk, and feathers and down hare been aad* pro-rLsnaJy by latter as indicated in the attached Thhls, kith respect to the lead and zinc prograas the market purchase of these materials is authorised and directed at prices below lk cents ' per pounds How Xoxfc, for lead, based an corrndlng grades and below 13 cents per pound.

the effects of lead accumula life, according to a scientist trial waste water.

34--Welding and Cutting shield or hood to control flash and fumes, and a ventilating system to carry off the metallic dust and oil fumes 7 Where flying sparks are not confined, the operators and nearby persons should be protected by shields of safety glass or other transparent material 8 Foot switches, air or electrical, should be guarded to prevent accidental operation Arc Welding and Cutting Arc welding is a process for ynning metals by heating with an electric arc or arcs with or without the application of pressure and with or without the use of filler metal The process includes shielded welding which uses gas or a solid flux to blanket the weld Arc welding is used to fabricate nearly all types of carbon or alloy steels, the common nonferrous metals, and is indispensable in the re pair and reclamation of metallic machine parts Arc cutting is being used only for rough cuts or for scrapping because of the unevenness of the cut obtained It has been used for under water cutting m salvaging operations Oxyarc or arc-oxygen cutting has been used for finer cutting and is especially useful for cut ting metals that do not oxidize readily Plasma arc cutting is now being used widely for quality cuts Also being used is carbon arc-air cutting which leaves a smooth cut For arc welding or cutting, two welding leads, the electrode lead and the work lead, are required from the source of current supply Usually, one lead is connected to the work and the other to the electrode holder The work lead (cable) is the most satisfactory means of providing the return (ground) cir cuit to the welding machine (Fig 34--6), but in some cases operating conditions may re quire the use of a grounded steel structure Power supply Either AC or DC may be used for arc weld ing or cutting of any kind, including carbon arc cutting and cutting with heavily coated electrodes With small diameter electrodes used on thin sheets for manual arc welding, current values vary from 10 to 50 amp For most manual welding, because the welder 960 Fic 34-6 --One conductor of a three conductor pnmary cable is permanently connected to the case of this AC welding unit and to the ground prong of a three-prong polanzed plug, thus making grounding of the case both sure and easy Courtesy IUinots Central Railroad must withstand the heat, current values should not exceed 500 or 600 amp Automatic machine arc welding may use current values up to 200 amp or even higher on special applications Commercial AC and DC power supplies aie not suitable for arc welding Conse quently, to convert commercial power for arc welding, a transformer and rectifier must be used for DC welding, and a transformer for AC welding A motor generator may also be used to produce alternating or direct cur rent Transformer, rectifier or motor gen erator welding may be either single or 3 phase

The laboratory report, as you have called It, has recognized that stippling is not necessarily Indicative of lead absorption and that in many Instances it has nothing to do with lead.

The patient has no signs or symptoms of lead poisoning.

TO PREVENT LEAD INGESTION 1.