They rare concerned rbetosr toeir lead-soldered eaas =iT.it hart a bad affect on tot httlto of children.

stoek systsn hss boon eliminated# May 1944 - Loss #546*20 First 5 months 1944 - Profit #30*452*41 May 1947 - Profit #41,311*94 First 5 months 1947 - Profit 348,400*45 Tho annual firs awards for 1947 for twonty nsshore in tho Lowls Firs^Dspartment were approved at s net cost of #149*00* This compares with swards fer eighteen members in 1944 at a not seat of #159*50* It was unanimously decided to make application for a CftB in the amount of #6,700*00 to eovor tbs soot of an additional 125 HP* 2300 volt slipring motor for tho grinding rolls in our linoood oil mill* It was unanimously dsddsd to make application for a OftR in tho amount of #13,617*00 for tho installation in our oxido furnaeo house of a ribbon blonder and eonvoyor to be used for tho mere effieient handling of HIM and 30W oxides* Mr* Shell presented a credit review and outlook for tho coming months* He fools that our overall plotura shews as exceptionally good condition at the present time* Bo divided our asoounto as followsi Lead dealer ascounts -- vary little dslinquensy Lead grinder aoeounte --~ very little delinquency Storage battery accounts-- Only one shew* any sign of dslinquensy Plumbing supply jobber accounts-- Overstocked* About twelve concerns are behind in payment end will need help from us during the next throe or four months Upon recommendation by Mr* Watts it was unanimously decided to make applica tion for a OftR la tho amount of approximately #3,500*00 to cover throe draw benches for oar metal department* A report of deliveries for the week ending Juno 13 was submitted* Mr* Wilson called attention to tho fast that tho small Dewthorm in our now oil mill baa boon in operation for tho past two weeks and wo have pro duced throe oils, namely LG-57, Ssterscy P and lispao 3* men# of which could NL 000040754 Jana 16* 1947 eoatinuad*,*.* ton tots pmdnead with or old aquipaant* 8a also raportad that or now tow* paint t* ta ha going vary wall* Wt* Qardinar haa writtan ta Mr.

Public Health Service, I came across a very interesting letter from you in regard to lead poisoning in children.

He has been appointed a member of the White Lead Sales Committee, succeeding Mr.

We have also issued a guarantee against decline on our white lead shipments for thirty days from date of shipment, but both items are moving on a hand-to-mouth basis.

Local Exhaust System TABLE 29-C RECOMMENDED MINIMUM DUCT VELOCITIES Nature of Contaminant Examples Duct Velocity (fpm) Vapors gases smokes fumes, and very light dusts Medium density dry dusts Average industrial dust Heavy dusts Large particles, of heavy moist matenals All vapors, gases, and smokes, zinc and aluminum oxide fumes, wood flour and cotton lint Cotton, buffing and jute lint, wood, grain, rubber, and bakelite dust Wool, wood, sand blast, gnnding, and shoe dust, wood shavings, foundry dust Lead, and heavy foundry dusts, metal turnings, jute butts Moist lead and other heavy dusts 2,000 3,000 4,000 5,000 5.000 and over Adaptedfrom Allen D Brandt "A Summary ofDesign Data for Exhaust Systems ' Heating and Ventilating (May 1945) air flows'* There are two solutions, the first is the better choice "Balance" can be restored--meaning each hood can be made to handle the amount of air it was supposed to--by sizing the duct work and selecting fittings that will give equal pressure drops in the two branches when air flow through hood A and hood B is at the de sired rates If one hood is exhausting more air than it should, smaller diameter piping will increase the resistance, air velocity will drop, and so air flowing into the hood will be reduced Air balance may be achieved by use of blast gates m each branch These are slide gates or dampers These can be set so they block partially the flow of air, lowering the amount of air entering the hood This is not the preferred method --for several reasons The chief advantage, however, is that much less talent is needed on the part of the de signer Advantages of the first method are (a) if velocities are initially chosen properly, duct work will not plug, (b) workers cannot tamper with the system and "rob" another work sta tion of air needed for contaminant control there, and (c) erosion will be less and there will be no buildup of dust or linty material caused by blast-gate obstruction This method is preferred where toxic materials are handled, and is mandatory where explosives, magnesium, and radioactive dusts are ex hausted The second method gives some leeway for correcting improperly estimated exhaust volumes, and provides some flexibility for future changes or additions However, a car dinal rule in local exhaust system design is that once a multihood layout is completed and balanced, additional hoods should not be added later They alter the air flows and can make some hoods entirely ineffective Push-pull Whether a system operates under positive (blowing) or negative (suction) pressure makes no difference insofar as duct design features are concerned Usually, how ever, exhaust systems have high air velocities to keep dust in suspension m the duct Posi tive pressure systems, those that supply ven tilating air to a given space, operate with relabvely low duct velocities Table 29-C shows recommended minimum duct veloci ties for handling different types of contami nants Energy losses occur in ducts m the following ways Velocity pressure A definite pressure or suction must be created by the fan to get air moving at a certain velocity As seen in equa tion (5), this suction, known as velocity pres- 866

Enclosed you will please find their lou will note that they were unable to find any lead in the urine and no stippling of blood cells.

or: METHOD OF PROTOCIHO _________ yHITF LEAD Dear Sir: ' I am sending you herewith copy of Mr.

This condition, we believe, is due to the dis charge of lead into the atmosphere, by the furnace stacks.

Signal Corps for 50,G9O lbs. of lead sleeving which will keep them busy for quite a while.

Under his stewardship, Dana grew into a world leading company with interests in distribution, in non-automotive markets, and overseas.

Ohicaso Balance Leceraber 31, 1943 TOTAL LEAD--in-- ZINC OXIDE TWITE LEAD HI

I am at a loss to understand why we never recovered more than 7C$ of the lead in this laboratory.

Board investigations on lead concentrations in the air at filling sheds handling leaded fuel operated by the Board.

Cement Lead or compounds of lead................. ...........