The only men wearing protective masks are those working with tetraethyl lead and those effecting tank measurements.

PROOF A FACILITIES Lead-sodiun alley Eleotrolytio sodium Tetraethyl Lead Tetraethyl Lead Antiknock fluid (ROUP B FACILITIES Ethyl Chloride Ethylene Dichloride Vinyl Chloride QBOUP C FACILITIES Hydrocarbon pyrolysis Olefin recovery and purification 2.

1315 Substance 1,1,2.2-Tetrachloroethane--Skin Tetrachloroethylene see Perchtoroethy- lene Tetrachioromethane see Carbon tetra chloride Tetrachloronaphthalene - Skin Tetraethyl lead (as Pb)-Skin Tetrahydrofuran Tetramethyt lead (TMl) (as Pb)--Skin Tetramethyf succmonitrile--Skin Tetranitromethane Tetryl (2.4,6-tnnitrophenylmethylnitra- mine)-Skin Thallium (soluble compounds)-Skin Thiram Tin (inorganic empds. except oxide) Tm (organic empds) Titanium dioxide Toluene (toluol) : Toluene-2 4-dusocyanate o-Toluidme--Skin Toxaphene, see Chlonnated camphene Tributyl phosphate 1,1 1-Tnchloroethane, see Methyl chloro form 1,1 2-Trichloroethane--Skin Trichloroethylene Tnchloromethane, see Chloroform Tnchloronaphthalene -- Skin 1 2,3-Tnchloropropane 1.1,2-Tnchloro 1,2,2-tnfluoroethane Tnethylamine Trifluoromonobromomethane 2,4,6-Trinitrophenol. see Picnc acid 2,4 6-Tnnitrophenylmethylmtramine. see Tetryl Tnmtrototuene--Skin Tnorthocresyt phosphate Triphenyl phosphate Turpentine * Uranium (soluble compounds) (insoluble compounds) C Vanadium (VjO.dust) (V,0% fume) Vinyl benzene, see Styrene ppm8 5 mg/cu m' 35 200 05 1 200 002 5 2 0 075 590 0 075 3 8 15 01 5 2 01 15 750 0 14 22 5 10 100 50 1 000 25 1.000 45 535 5 300 7 600 100 6 100 - 15 - 01 -3 too 560 0 05 - 0 25 - 05 01 C Vinyl chloride Vinylcyanide, see Acrylonitrile Vinyl toluene Warlarin Xylene (xylol) Xyltdine--Skin Yttnum Zinc chlonde fume Zinc oxide fume Zirconium compounds (as Zr) Radioactivity For permissible concentrations ot radioisotopes in air, see U S Department ot Com merce, National Bureau of Standards Handbook 69.

Threshold Limit calculated from the formula 250* SiO, + S ** Cnstobalite Amorphous including natural diatomaceous earth Tremolite 20 5 SILICATES (less than 1 % crystalline silica) Asbestos 5 Mica 20 Soapstone 20 Talc 20 Portland Cement 50 GRAPHITE (natural) 15 "Inert" or Nuisance Particulates SOforlSmg/m5 whichever is See Appendix 0 the smaller) Conversion (actors mppcf x 35 3 -- million particles per cubic meter = particles per cc e> Millions of parlulis per cubic foot of air. based on tmpiiigcr sjtnplcs counted h> light-field techniques n The percentage of crystalline silica in the formula is the ainnimt determined from air borne samples, except in those instances in which other methods have been shown to be applicable See "Notice of Intended Changes These substances, with their corresponding values, compose those for which either a limit has been proposed for the first time, or for which a change in the Recommended* listing has been proposed In both cases, the proposed limits should be considered trial limits that will remain in this listing for a period of at least two years During this time, the previously Recom mended Limit will remain in effect If, after two years no evidence comes to light that questions the appropriateness ol the values herein, the values will be placed in the ' Recommended" list Documentation is available for each of these substances Substance ppm* mg/cu m1 Abate Boron tnbromide Bromine pentafluonde 4 Butyl mercaptan *C Cadmium oxide fume (as Cd) Camphor Chlorine Cyanogen 44C Dichloroacety- lene C Diethylene C Diethylene tnamine- Skin Diphenyl amine 44 Endosulfen (Thiodan) Skin * Ethyl mercaptan Fibrous glass 10 01 05 2 1 10 01 10 - 05 - 15 01 10 01 $ Heptane Indene Indium and com pounds, as In Iron salts, soluble, as Fe Methyl isoamyl ketone Methyl mercaptan Methyl silicate Octane Oil mist (particulate) Oil vapors Pentaerythritol (tetra- methylomethane) Pentane Petroleum distillates Propargyl alcohol-Skin RDX-Skm Stoddard solvent Styrene Tetraethyl lead (as Pb)-- Skin Tetramethyt lead (as Pb) --Skin Tnmethyl benzene Tungsten and com pounds, as W Soluble Insoluble Uranium, sol and insol compounds as U 500 10 100 0!

A* Petarsoa national Refining Company Cleveland# Ohio Dear Hr* Petersont ' X wish to aoknowledge receipt of a copy of a letter from L* S* Paxton* Mankato* Minnesota* concerning a filling station operator at Austin* X wish also to apologise for asy delay In replying to this letter which unfortunately as mislaid# X should like to-point out in tli beginning that there Is nothing in Mr# Paxton*s letter which would suggest that the operator had lead poisoning* It seems quite clear from the description of the case that his ailment was that of gasoline dermatitis# aggro* voted in 3ome degree by his us of laeSier gloves which became saturated with gasoline# 2 doubt if anyone could handle gasoline in this fashion without developing some injury to the skin* In as much as many people are quit sensitive to gasoline# X should consider this man rather fortunate In not having serious damage done to his skin* After seme years of experience and of study of this problem# we have been quite unable to find that the small amounts of Ethyl Fluid in gasoline Increase its propensities for producing skin irritations* Gasoline indeed is much more Irritating than are any of the concentrated ingredients of Ethyl Fluid taken by themselves, Tetraethyl lead in its pure fora does not cause a significant degree of skin Irri fcation* whereas gasoline applied to the skin Is known to produce dermatitis quit eowtaonly# M t h the Introduction into gasoline of the products of various types of ^cracking"# it becomes even more Irritating so that gasoilno demafci tis is by no means an uncommon lesion* In mist instances* I believe# the irritation Is the result of the extraction of the oil from the skin# leaving it dry and cracked* Such a skin Is easily infected with results which depend upon the infecting organisms* There is no specific remedy for this condition# Xt has been our experience that coses of this type of dermatitis do not recover completely unless they avoid all expo ure to gasoline until their skin Is entirely well# Skin lesions may be treated with any one of a number of mild antiseptic ointments* They o...:* Z * f l .''

March 7, 3.940 Dr* B# Hurtado Colombian Petroleum Cotap any Cucuta# Box 100 Colombia,* South America Dear Doctor Hurtado* I was very sorry to have missed you on the occasion of your recent visit to Cincinnati# for I should have been pleased to talk with you about various phases of our work* I am sure you obtained all of the practically useful Information from Dr# Sanders however* so that I trust your trip to Cincinnati served your purpose# I believe you received most of the reprints of our work which were available* On the other hand there was a series of articles which had been translated into Spanish# which# X believe# will be useful to you in that language# Accordingly I have sent you,under separate cover* copies of these translations* If you should find that you require additional copies of these translations# please do not hesitate to lot me know for I had these articles translated primarily for the use of medical men who are concerned with this problem* I should appreciate it if you would drop me a note from time to time# letting me know of your progress and specially of any difficulties which may occur# Our experience in other countries in connection with the occurrence of difficulties may well be of some value to you if such trouble should arise# In any case I try to keep in touch with what occurs in various parts of the world in this connection# It is possible that your attention was not called with emphasis to the rather serious hazards which may be associated with the cleaning out of storage tanks which have been used over a considerable period of time for the blending and storage of leaded gasoline# We have had a series of accidents In this country which have been the result of failure to carry out the regulations which we have prescribed in connection with this work* It seems that from time to time a group of workmen will Insist upon entering these tanks for the purpose of cleaning without being supplied with the necessary protective clothing# and especially with an airline hose mask# Under certain unusual oiroumatmoos it may happen that concentrated Ethyl Fluid Introduced into the gasoline in too rapid a streara,may sink to the bottom of such tanks and lie there over a period of months or years in the sludge# This happens, of course, only if there is a water bottom in the tank# Subsequently when men enter such a tank to clean it, they may have serious contact with concentrated Ethyl Fluid, and they may also be exposed to relatively concentrated vapors of tetraethyl lead# All of these things can be avoided by proper attention to the regulations which we have devised and which are given in detail in the booklet of regulations which you have# I call your attention to this point as being the one thing which is moat* likely to result in serious difficulties, in order that you may warn your people against this danger and urge upon them the necessity of proper precautionary measures* Cordially yours.

As a consequence of this <,, opinion I have been able to obtain , the serviees of several good physicians who work under my direction, and who assume the responsi bility for the medical care of men who are.engaged in all aspects of the production and distribution.of tetraethyl lead and EIHXL fluid.

There was no evidence of the presence of any tetraethyl lead or triethyl lead compound.

Tanks, see Septic tanks and Storage tanks Tanks, open surface, exhaust, 881, 891, 1603 Tar, 1374, 1429 Taipaulins, 1058, 1107 Tape recorders, 239-240 Tapping, metal, 955 Tapping out cupola, 811-812 open hearth furnaces, 815 Task performance, 74-77 Tasks allocation, 105-107 analysis, 106-107 Teflon, toxicology, 1375 Telephone alerting system, 1129 Teleprompters, 229 Television, 238-239 during emergencies, 1139 publicity, 207-210 radiation hazard, 1468 training, 157 Tellurium, 1375 Temperature autoignition, 1011, 1387 table of, 1395-1421 conversion tables, 1580-1581 definitions, 1253 effective, 909, 1253, 1263-1264 measurement in air, 907-909 Tempering tools, 951-952 Temporary total disability, 256-258 Tenosynovitis, 1325 TEPP, 1375 Terrain, building site, 393-394 Testing driver, 627, 631, 1548-1549 electrical equipment, 996-1000 medical, 1229 nondestructive, 826-829 psychological, 1547-1548 Tests, see Inspection Tetany, 1325 Tetrachloroethane, 1350-1351, 1375 Tetrachloroethylene, 1350-1351, 1375 Tetrachloroethylene, 1375, 1350-1351 Tetraethyl lead, see Lead Tetrahydrofuran, 1376 Tetryl, 1376 Texture of control, 117 Thallium, 1376 Thermal environment, 1263-1264 Thermometers globe, 908 wet and dry bulb, 907,1253 Thermonuclear reaction, 1440 Thermoplastic, definition, 1429 Thermosetting, definition, 1429 THERP, 76 Thiocyanates, 1376 Third party liability, 295-296 Thorium, 1440 Three E's of safety, 6-7 Threshold, hearing, 1521,1525 audiometry, 1512-1513 limit values, 1532-1535 Threshold limit values, 1253, 1284-1286, 1306-1322 calculations, 1317-1321, 1386 chemical substances, 1172-1173,1308-1321,1614 noise. 1513,1528-1529 damage risk criteria, 1270 sinusoidal vibration, 1617 Thulium-170, shielding, 1476-1479 Tilt table saws, 786-787 Tienng hoists, 565 Timbers construction, 1049-1051, 1072 inspection, 454 ram prop dimensions, 837 stresses (table), 1574-1576 tower dimensions, 450, 1575-1576 Tinnitus, 1521 Tires, vehicle, inflation, 1553-1554 Titanium, toxicity, 1376 Titanium dioxide, 1376 Titanium tetrachloride, 1376 Toeboards, see Railings and toeboards Toilet facilities, 1216-1217 Tolerance, 1325 Toluene, 1377, 1429 Toluene 2,4-dnsocyanate, 1377 Tone deafness, 1521 simple (pure), 1520 Tongs, 961 pipe, 960 Tools, hand, see Hand tools Tools, machine, see Machine tools Tools, power, see Power tools, portable Torches blow, 1043, 1058 during construction, 433 welding and cutting, 929-930 Tornados, planning for, 1114-1115 Torsion tools, 959-962 Total disability temporary, 260 total, 259-260 "Total safety" concept, 25 Tours, plant, 201 Towers dimensions, 450, 1575-1576 maintenance, 458 Towing bulldozers, 1568 trucks, 1562 Toxaphene, 1377 Toxemia, 1325 Toxicity chemical, 1106-1107,1300-1306,1446 1651

This resulted in five cases of Tetraethyl Lead intoxication, but I am glad to say that on this occasion there were no deaths Inclosed is a copy of a report prepared by Dr.

This is equally true of the two articles on "An Appraisal of the Load Hazards Associated with the Distribution and Use of Gasoline Containing Tetraethyl Load.

I was very sorry to have missed you on the occasion of your recent visit to Cincinnati* for I should have been pleased to talk with you about various phases of our work* I am sure you obtained all of the practically useful Information from Dr* Sanders however* so that I trust your trip to Cincinnati served your purpose* / I believe you received most of the reprints of our work ishtch were available* On the other hand there was a series of articles which had been translated into Spanish* which* X believe* will be useful to you in that language* Accordingly I have sent you,under separate cover* copies of these translations* If you should find that you require additional copies of these translations* please do not hesitate to let me know for I had these articles translated primarily for the use of medical men who are concerned with this problem* 1 should appreciate it if you would drop me a note from time to time* letting me know of your progress and specially of any difficulties which may occur# Our experience in other countries in connection with the occurrence of difficulties may well be of seme value to you if such trouble should arise* In any case I try to keep in touch with what occurs in various parts of the world in this connection* It is possible that your attention was not called with emphasis to the rather serious hazards which may be associated with the cleaning out of storage tanks which have been used over a considerable period of time for the blending and storage of leaded gasoline* We have had a series of accidents In this country which have been the result of failure to carry out the regulations which we have prescribed in connection with this work* It seems that from time to time a group of workmen will Insist upon entering these tanks for the purpose of cleaning without being supplied with the necessary protective clothing# and especially with an airline hose mask* Under certain unusual oircumstmcos \ 2* * - it may happen that concentrated Ethyl Fluid introduced into the gasoline in too rapid a stream may sink to the bottom of such tanks and lie there over a period of months or years in the sludge# This happens of course, only if there is a water bottom in the tank# Subsequently when men enter such a tank to clean it, they may have serious contact with concentrated Ethyl Fluid, and they may also he exposed to relatively concentrated vapors of tetraethyl lead# All of these things can b avoided by proper attention to the regulations which we have devised and which are given in detail in the booklet of regulations which you have# I call your attention to this point as being the one thing which is most* likely to result in serious difficulties, in order that you may warn your people against this danger and urge upon them the necessity of proper precautionary measures* Cordially yours, RAKiiS r ^ FT1 7 " k5H^710* KE" 00J34a0

Kille of the insurance com pany asked me whom he should contact in our organiza tion in the event that his people felt there was a joint legal responsibility between his company and ours in the death of Hubbard* because of the fact that vie introduced the tetraethyl lead into the tank at Tampa.

. , 1927, and observed a mix made in the proportion of 2-1/4- c.c. lead tetraethyl per gallon of gasoline.

TETRAETHYL LEAD.