This publication was brought about because accidents are "one of the leading causes of death and an outstanding cause of permanent and disabling injuries among children."

Lack of proper evaluation, or improper installation may lead to unsatisfactory results.

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.

A series of lead-dropping tests j Ignitron rectifier circuits was conda& daring March 1952 on an alamltS potHne at the Mead Washington VuT of the Kaiser Aluminum A Qj^alt.

These considerations, in conjunction with those of barometric pressure and the difference in density of flue gases from that of air, lead to the fol lowing formula: 393

Conduit (G) is of cast-iron construction, assembled with lead joints and is water-tight, if properly laid.

These considerations, in conjunction with those of barometric pressure and the difference in density of flue gases from that of air, lead,to the fol lowing formula: D, = 2.96 HB0 (1) 409

A good statistical ences between the epidemiological approach study of cases of cancer of the lung occur and that used in the studies which have ring in a group of auto|>sie$ can lead to a been reported to date.

. /' As to th e d is c u s s io n in your f i n a l p arag rap h , s u b je c t to ap p ro v al by o u r Board o f D ir e c to r s , we have d e c id e d on T h u rsd ay and F rid a y , November 6 th and 7 th , 1958, as th e d a te s , and The Drake in Chicago as th e p la ce o f our proposed Lead Hygiene C o n fe re n c e .

(This, providing he had. lead exposure}* .

This leads to a further-sound attenuation.'

Designs based on number of air changes per hour, or other rule-of-thumb methods, are hopelessly inade quate, and lead either to unsuccessful operation or to excessive and un necessarily high cost of installation. 1.

Air pollution in Pittsburgh, *44 Emery: See Dust Emphysema pulmonary bullous: cause of spontaneous pneumo thorax in patients with silicosis, 527 Endarteritis obliterans: in worker exposed to lead, 418 Energy, Exchange: See Metabolism Engineering control of occupational health hazard [Postman], *169 Environment exposures: classification, 332 in mines: observations on effect of locomotive haulage, 335 odors : control of, 217 physical side of comfort, 206 plant: study [Adley], *153 Epidermis: See Skin Epilepsy atypical: in industrial medicine: electroencephalograph, 521 detection by Erythrocytes diameter: affected by chronic action of benzene, 109 Heinz bodies in: significance, 328 sedimentation: See Blood, sedimentation Estrogens adsorption and toxicity: in male workers In chem ical plant, 424 Ethylene Glycol triethylene glycol vapor: lethal effects of on dried air-borne bacteria, 408 trlethylenc glycol vapor: rate of bactericidal action on micro-organisms dispersed into air in small droplets, 435 trlethylene glycol vapor and water vapor: com parison between influence on bacteria content of air in playroom In children's home under ordinary working conditions, 437 Executive exhaustion in young business, 204 Exercise protein requirement of hard workers: Influence of pure proteins extractives on ability to work,'411 tolerance test: significance [Renner], *129 Explosives new safety: for dusty or fiery coal mines, 435 Extremities: See also Hand injuries to lower: their significance in industry, 216 Eyes : See also Conjunctiva ; Vision fundus: alterations, do they accompany blood changes in benzol poisoning?

TABLE 15 Relative Flammabilities of Dusts Relative flammability (%) Powder In In furnace spark test teBt Metals Aluminum, atomized Aluminum, stamped Antimony Cadmium Chromium Copper Dowmetal Iron, hydrogen reduced Iron, carbon reduced Iron carbonyl Magnesium, stamped Magnesium, milled 10 60 65 18 0 3 90 90+ 90+ 85 90+ 90+ 78 80 18 0 0 0 90 65 43 60 90+ 90 Lead, stamped Manganese Silicon Tin Titanium Titanium hydride Zinc Zirconium.... ......

Romero, Alberto The new "Kipres process for the manufacture of asbestos-cement fittings by injection" Asbestos 42, #5, 14, 16 (Nov, I960) An injection machine for forming pipe elbows and tees, patented by S, Casanova, Valencia, Spain. 253 Business Periodicals Index 3, #4, 4 (Nov. i960) Greening, W.E, Profit potentials in-asbestos under world-wide expansion, with data on leading companies Mag.