In suspicious cases both lead and arensic must be ruled out.

or covered with -saint cr any other mat erial containing lead or other substance of a poisonous nature, Irorucs^SjLjdJJi afclgh jglasiai unless such article shall contain a label affixed thereto stating in clear and unambiguous language that the said paint, or other :naterial contains lead or other substance of a poisonous nature."

In making SWP. we take the while lead cuibcmaie, used in hand mixing "!

Welding and Cutting air-cooled with two-winding primaries The transformers should be built in accordance with the high standards of electrical construc tion used on power or distribution trans formers A typical industnal-rated AC transformertype welding unit should be equipped with a voltage-reducing control which automati cally reduces the open-circuit secondary volt age to 30 volts during idling This reduction of the voltage is delayed two to three sec onds from the instant the arc is broken to prevent interference with normal welding operations Contact of the electrode to the work automatically restores normal welding voltage Other safety features are (a) cir cuit breaker, integrally mounted on the unit, for providing thermal overload protection and serving as a convenient disconnect switch, (b) circuit breaker of the automatic type or a fused safety switch mounted on the wall and rated for use with the unit and the power supply circuit, (c) three-conductor power supply cable, one conductor of which is for grounding purposes, between the wall mounted breaker and the unit Large welding machines are usually in stalled as stationary units Since primary line switches are not normally provided as part ofthe equipment, they should be installed by the person making the installation The smaller machines, which may be used as portable units, customarily have primary switches built into them and are provided with primary cables and attachment plugs of proper capacity Welding transformers should not be attached to lighting circuits under any circumstance If a gasoline-powered welding generator is used inside a building or in a confined area, the engine exhaust should lead to the outside atmosphere Otherwise, carbon mon oxide and other toxic gases may accumulate Voltages The voltage across the welding arc varies from 15 to 40 volts, depending on the type and size of electrode use The welding circuit must supply somewhat higher voltage to strike the arc This voltage is called the open circuit or "no load" voltage After the arc is established, the open circuit voltage drops to a value about equal to the arc voltage plus the lead voltage drop The open cir cuit voltages on DC welding machines should be less than 100 volts For AC transformer welding machines, ASI Standard Z49 1, Safety in Welding and Cuttmg, prescribes a maximum open circuit voltage of 80 volts on manuals, 100 volts on automatics Some standard heavy duty industrial AC welding machines have open circuit voltages of 65 volts Reliable control equipment is available which automatically reduces the open circuit voltage to about 30 volts during the "off" arc period, at which time the welder may be exposed to the open circuit voltage This control equipment is commonly used where welders are working outdoors on wet steel or m confined quarters or under other severe conditions where the probability of contact with the open circuit voltage may be greater Heavy duty AC welding machines (ratings usually over 500 amp for automatic machine welding) are also built with open circuit voltages of 75 to 80 volts with a special tap to provide 100 volts where necessary The tap may be needed to obtain rated output from the machine if the line voltage is low or if the voltage of the secondary circuit drops The tap should not be accessible to the welder for current adjustment but should be under the control of a responsible electrician or supervisor Open circuit voltages should be as low as 50 volts on small AC welding machines used without expert supervision Since these ma chines are often used with low arc voltage electrodes and with leads not more than 20 ft long, the probability of a large voltage drop m the welding circuit is small For other manual and automatic welding and cutting processes m which the work metal is connected electrically to one side of the circuit Open circuit voltage of 150 volts may be allowed provided the following conditions are present 1 All equipment and circuiting are fully insulated and the operator cannot make electrical contact other than through the arc itself, while the arc is maintained 2 Disconnecting or voltage reducing de vices operate within a time limit not ex ceeding one second after breaking the arc 934

Pertlculatad lead has been found by URI scientists not only in Bay but In Ant arctica.

Both of these are white house paints based on a conventional high linseed oil content and TGL5519-A is a lead free type.

., "That's because of the greater risk to human health through the conrestrictions on the, amount of leaded gas that's used v.lsumption of contaminated seafood.

38--Industrial Toxicology tinent or from the United States, although in both areas there have been several exten sive investigations of this question Teflon resms are available m two types the TFE resm (tetrafluoroethylene polymer) and the FEP resm (fluonnated ethylenepropylene polymer) Both are physiologically inert The products of pyrolysis of Teflon below 392 F are nonhazardous, but above this temperature, several fluorocarbon gases, hy drogen fluonde, and a sublimate are formed These do not appear to be toxicologically sig nificant until about 482 F At 716 F, small amounts of toxic gases, which have caused death by pulmonary edema in experimental animals, are evolved The only known difficulty in human exposure has occurred when Teflon resins are processed at 644-725 F At these temperatures, a condi tion somewhat like metal fume fever is ex hibited, but recovery is rapid, usually m 48 hours or less All operations that can lead to the pyrolysis of Teflon resins should therefore be prohibited, particularly smoking where the tobacco may be contaminated with Teflon dusts Tellurium is found as a trace element in various minerals and is used m small amounts m a number of industries, especially the glass industry It increases the machinabihty of some metals and improves the toughness of rubber hose and cable and the hardness of lead In man, the absorption of even a very small amount of tellurium m any form is imme diately followed by the production of a gar licky odor in the breath and the sweat, due to the elimination of minute amounts of tellurium as methyl tellunde This elimination is likely to continue for weeks or months Hydrogen tellunde, a poison gas similar to arsine and hydrogen selenide, destroys the red corpuscles It is believed to be more toxic than either, but is not so often encountered in industry In an investigation of workmen in a foundry who had been exposed to 0 1 to 10 mg of tellunum per 10 cu m of air, a large per centage of the men showed the garlic odor of the breath and sweat and also complained of dryness of the mouth and a metallic taste 1172 Men with the highest exposures, who also had the highest rate of tellunum excretion, showed drowsiness starting in the early afternoon and later becoming more severe Complaints of appetite loss and nausea at these relatively low exposures were less common TEPP (tetraethyl pyrophosphate) is the ac tive ingredient in an insecticide mixture that goes by the same name Since the estimated fatal dose for a human being is approximately 600 mg taken orally, it is in the class of highly toxic matenals In its use, toxic dust respirators or supplied air respirators and protective clothing which will completely prevent skin contact should be worn Anyone with a severe headache or a feeling of tightness or constriction m the chest should leave or be removed immediately 1.1.2.2- Tetrabromoethane (acetylene tetrabromide) is a high-boiling, heavy, yellowish liquid used as an indicator liquid in gages and for separating minerals by density Its low vapor pressure at room temperature makes it safer to handle than might be ex pected The LDm for rabbits and guinea pigs is about 0 4 gm per kg of body weight Ex posure to the vapor causes respiratory irrita tion and damage of the liver appearing a few days after a single acute exposure 1.1.2.2- Tetrachloroethane (acetylene tet rachloride) is an excellent solvent for a num ber of paints and lacquers It is also a very dangerous compound since inhalation of it at a concentration that is barely perceptible by odor can lead to extensive liver damage Tetrachloroethylene (perchloroethylene) is a chlorinated solvent used primarily for de greasing It is Similar in its properties to trichloroethylene except that its boiling point is slightly above that of water so that boiling degreasers containing it automaticallv keep themselves dry without loss of solvent Its most important toxic effect is depression of the central nervous system In experimen tal exposures of human subjects, those exposed to concentrations greater than 200 ppm promptly suffered central nervous system symptoms, while those exposed to about 100 ppm did not

An attempt was made by two men to steal pig lead.

Lavino & Company Lead Industries Association --M-- Mackintosh-Hemphill Company Macklin Company Magma Copper Company Maryland Self-Insurers' Association Mayer Chinn Company J.

I should like to urge (get him to) him to find out about ------amounts of lead in the excreta.

Finish Coat--100 lbs. white lead soft paste, 2 2/3 gai. raw linseed oil, 3 pints turpentine, 1 pint liquid arier, total o 1/& gal. paint.

National Lead & Oil Co of Pa..

Where ahildraa are ta hare acaaaa ta tha surface, tha paista peraittad ahaald eeaply with tha established standard af ABA (aaw ANR) XOd.l af 1% ceil-- lead eaataat* jilt Imi dfPita da have a assfal aad iapsrtaat foactiaa ia aadara day paiata.

Where ahildraa are ta hare acaaaa ta tha surface, tha paista peraittad ahaald eeaply with tha established standard af ABA (aaw ANR) XOd.l af 1% ceil-- lead eaataat* jilt Imi dfPita da have a assfal aad iapsrtaat foactiaa ia aadara day paiata.