The preparation and submission of 3uch reports will inevitably lead to a 8 'ti & V. . \.fe greater amount of preventive work in industry.

Construction The ducts leading from the hoods to the exhaust fan should be con structed of sheet metal not lighter than is shown in .Table 4.

92 CHAPTER 4 recommended in the United States, though Germany seems to have been unique in specifying a tolerance dose ten times stricter (0.025 roentgen per day) "when there is a possibility of (germ-line) genetic damage."66 In 1942, special regulations were established to govern nonmedical uses of X-ray technologies--as, for example, in the construction industry, where the rays were used to locate flaws in metal castings and other materials.67 German regulations may have been more strictly followed than those promulgated else where, judging from the massive outpouring of compliance litera ture produced in the wake of the law, detailing optimal levels of lead shielding, control of beam coherence, and so forth.68 Anyone wishing to install or operate an X-ray machine had to demonstrate compliance with these regulations.69 Efforts also continued to document radiogenic cancer.

This results in the collection of frost on the heat transfer surface which in turn leads to a rapid loss in capacity and requires eventual defrosting.

Where exact performance data are not available this assumption is a desirable one since it leads to a conservatively large determination of the power required.

Aprilf 1947 M-P 4 More .Companies Join Foundation Thirteen organizations have affiliated with the Foundation since the first of this year, including some of the nation's leading industrial concerns.

ELECTRICAL EQUIPMENT. tllVATORS"*)*' FEATBRE ARTICLES Raw-water softening experience in Canada's largest steam plant Electrical angle determines lead limit on motor and generator How spedHe speed affects centrifugal-pump performance Soot removal: an operating must--second in a series.....................

HAZARDOUS INGREDIENTS ********************** INGREDIENT 444* Mil NATURE OF HAZARD t>*i % *ii TLV 4*44 **4 4*44 M* ft *4* PPM Mg/M3-MPPCF LEL UEL LD50 4 f4 4 4*4* vr 444* *444 444* 444* - BaCd COMPLEX - LEAD CHROMATE - HEAVY METAL - HEAVY METAL 4**4 *## 44** *44* ##* lit# #44 ** l 4* MM *4 4# *4** *4 4*44 *4 *#4 44* 44* 4 44 *444 * # 4 44* #44* *44 4**4 44** *# 4*4* * alii *444 444* *44# 44# Mil 44*4 *44* *44 ft #4*4 4*44 4*44 4*4 4 * *** I44 4* # 44 4* 4Pt 444* 4 #* # ** HIM ft 4 4*4 **# ## #4 ua* MM 4 4 ft 4*44 44# MM MM MM 4*4* MM Mtl MM 4i| Mil IMI MM 4 MM Mia * ************************** SECTION III.

Sevan:'#''' A ssociated Eth yl lt d * A r t i l l e r y H ou se, A r t i l l e r y Row London SW 1 , En glan d -- Dear Ray: I H are a copy o f y o u r l e t t e r o f May 1 3 , t o ge t h e r w it h a copy o f you r "R egu lat ion s Govern in g th e Clean in g, Scalin g and R e p a ir in g o f Tan ks Which Have Con tain ed Lead ed G a so lin e ," Fo r what ay comments may be w orth ( a s t h ey a r e v er y fe w ), I am h er ew it h makin g them in Se c t io n an d P aragraph r e fe r e n c e : I N T R O D U C T I O N GENERAL: We do n o t p u t a sign on t a n k s, such a s you n ave in d ic a t e d in t h i s se c t io n .

{g,.yaMMi Consideration of the compositions of Pigment BX-CR (20$ CPC. 75$ TiOo and 5$ unknown) and BP-237-0 (20$ CPC, 75$ Whiting and 5$ moisture) together with the fact that Phtbalocyanine pigments are substantially always used in linoleum in conjunction with more or less prime white (usually TIO2) lead to the conclusion that valid compari sons Should be based on compositions containing equivalent amounts of prime white and equal pigmentations.

For one thing, there is the fact that many of Germany's leading antitobacco activists were also war criminals.

In constsot uaetodey by many leading power plants.

ta tiio liOapf^T^TXl^SuIt^^ 02^001^ 3m* ' ',;bo the tiaaly aid of a aesiber of our ^odioal staff, the latter oases ara now out of danger* 2a this particular Instance, a tank -easts cleaned on i&ioh there appear to bo no liistery of spiking* So far as we knew, tho task has never contained anything other than leaded rogul&r gasoline isawing a ad caKaRaferstioa cot above uorral* Air lias EJftske and proper precautionary rscasurea were taken. until the tank traa doteroisod to be g&s free* To ruu&s woro worn in tho handling of sludge* The aaa were exposed for varying intervals of tins** The aathori'ty nan who approved t5s bank cleaning; ia .this ease ms eontooted last Jaamry# An effort Isul been isade to see Ma and bring hia up to data on the h&ssrds Involved as late as a few moles ago# b^ertttmtely, he ms out of tom when this contact ms nads* In azy event, the fact remiss that ha did net notify us &od our safety engineers were not asked to bo - presect for. the -tank eloaning operation* "Psora could bo no bettor oxassle of the things we are trying to overcoraa l?

The material for electron microscopy was embedded in epoxy resin and stained with lead citrate.

Thorough study of conditions Pointed up in graphic style Heot-cycle studios were based < i actual-operating loijlv 1949. on the theory that If a change were warranter iwS&iil Jhfl leconit major rarloblt In powar coat, waa not, present leads it would be imperative for future needs, tv aflecred by Ihe now power cycle.