ELECTRIC HEATING UNITS In general, an electric heating unit is considered to be a structure con taining one or more heating elements, electric terminal connections or leads, electrical insulation, and a frame, casing or other supporting means, all assembled together into a unit.

Unexpected difficulty was en countered in filtering the lab. control samples* An extraction study was also undertaken without any good leads developing and no good samples were obtained from the grind with 10$ Blancol.

.* find tliat -ve can c o n tr a c t w ith the .Foundation to do a s u r v e y of the type ind icated, in which lead is only one of a num ber of elem en ts to be in vestigated , under conditions which lea v e th is L aboratory free to do its w ork p rop erly and to handle its rep orts in a m anner which is in accord with cu r p o licies, it m ay w ell r esu lt in changing m y attitude toward the en tire problem w ith w hich Ethyl is faced .

The formula they approved is as follows: V I T M E FROM ETHANOL 70.00$ by volume ethanol (73*5$ of a 95$ alcohol) 1 .05$ methyl isobutyl ketone 0 .10$ alpha terpineol 0.13$ sodium oleates & sulfonates) soluble oil 0.37$ kerosene ( inhibitor 28.4$ water Plus 3.0 cc tetraethyl lead per gallon.

LEAD INDUSTRIES ASSOCIATION 4J0 LXX1J.3TCN AVC.NUI MM row 17, n Y, Status Chaa*;ei CCA' 022 IIUB0I3 0 HkSSACHtUErS WCHIGAJI KT7 HAXP3H1RS CKUHCK1 films W Bew Bill* ILLINOIS #1 C ,t t >v <d> LBsisiATnrg r s p c k t fis State July y>, 1951 mxmzmxmv9 iifrmf m *rm* vilx~*n_, Hsum 8,63 Dorirtnpnt of labor &r.d Industrial Ralatlone, kilicu la derate ttiy 11, H.271 Industrial Hyrlt.os. fused House Hay 21, 3.292 rat*r pollution.

In computing the Table 20 values, consideration of the dependence of the indoor surface conductances upon temperature and direction of heat flow leads to surface conductances averaging about 1.50 for block and vertical glass, and about 1.80 for horizontal glass, as compared to the value of 1.65 used in computing U values given in other tables , in this chapter.

With continued investigation and study it will allow us to more accurately and completely fill in the missing pieces ofthis fascinating puzzie, thus leading us to a better understanding of the pathogenesis of chemically induced cancer in the biologically complex human system.

A number of new membership "leads" were developed.

It la desirable to saleot an area where tha esoeps of fibre or duet would not lead to trouble* Zt la also Important that fullyreliable workmen should be selected to operate these machinesi I note that It la thought that t team of three man Including one ehargehand would be adequate for the time being* V# quite understand that you would wish to sake arrangements for so much so possible of tha neoaaaary equipment to be manufactured In France, and Mr* Dolbey will, therefore, see that you obtain all tha necessary (, cont*..d.) 4BMMi j.

Mica aust was found to lead to som e degree of nodular form ation in the lungs, but the a sb estos dust set up diffuse fib ro sis only.

LONDON Australian Blue is an ideal fibre for asbestos cement and for pur- poses requiring good heat insulation and acid resistance It possesses excellent spinning properties Samples are available upon request Page 36 ASBESTOS S-eptember 1955 e r Ba Grip NAIL _ PROOF no discoloration $ GREATER HOLDING POWER <SMALL INCONSPICUOUS HEAD * STRONG ALUMINUM ALLOY easy to drive The finest proof staining aluminum nails ever offered for the application of asbestos siding Because of a special NICHOLS process an increase in nail strength has been developed that insures maximum drivability Small diameter head and thickness assures minimum visibility once nail has been driven Special threads developed by NICHOLS provide ultimate withdrawal resistance in Grip Aluminum Nails are available in 1-7 and 1-3 lengths Thread lengths Aluminum Nails are available in 1-1 New NICHOLS Aluminum Thread nails are used for applying asbestos Screw Thread NAIL siding over plywood sheathing and many other types of new work These nails are now included with asbestos siding and shingle shipments of many leading asbestos products manufacturers Write for free samples and descriptive literature Address Dept A.

The pathologic processes resulting from the inhalation of asbestos particles are believed to be due not to their chemical nature but, rather, the consequence of mechanical irritation from fibers lodged in the respiratory tree.18-20 The inhaled particles are, in general, too large to pass beyond the respiratory bronchioles and so they remain there to initiate a foreign body reaction which eventually leads to fibrosis.21 The pathologic sequence of events can be considered as occurring in three stages: (1) desquamation and exudation, (2) formation of asbestosis bodies and (3) fibrosis and scarring.

Man fred Bow ditch Lead I n d u st r ie s A sso c ia t io n .520 Lexin gton Avenue New York 17, New York Dear Hr.

At Broken Hill, where lead, zinc and vanadium are mined; practically no free silica occurs in the ground worked, and dust counts do not suggest danger of pneumoconiosis.

In my opinion, the men who were to do this work should have the same type of medical supervision that is provided for persons who handle tetraethyl lead, but I hesitated to impose this upon Curtiss - Wright, or to intrude into their medical activities ^without their full understanding and approval.