y,c T *v / HEALTH AND SAFETY ACT id fit HEALTH AND SAFETY RULES RULES A-M f H* .

Contents 8 Pathology of Coal Workers' Pneumoconiosis Arthur J Vorvald, M.D. 35 9 Epidemiology of Coal Workers' Pneuaoconioais in Vales M.

2k7. over the long range period of time on safe levels of dust, because of the individual exposed long enough toa dust, he will get the same effects over a long period of time which he canin a short period of time in higher concentration.

Page 3 pedal is being "pumped," the end of the hose must be submerged in the fluid.

the present time, plans are under way to eliminate even these.

whenever possible, and this can be accomplished successfully only when we have a complete understanding* There nay be times when we may not have the immediate answer, however, again it is our responsibility to assist you in getting the answer to your problems.

TABLE OF CONTENTS PAGE Foreword.......................................................................... 3 Basic Service Systems.................................................... 4-5 General Brake Information............................................ 5-11 Coefficient of Friction..................... 11-12 Actuating Systems........................................................ 12 Mechanical................................................... 13 Hydraulic....................... 14-15 Vacuum........................................................................ 15-18 Air................................................................................. 18-20 Electric . .................................................................20-21 Service Technique of Modern Brakes...................... 23 Lockheed Single Cylinder Brake......................... 24-27 Lockheed Two Cylinder Brake............................. 27-28 Ford Hydraulic Brake (1939-48)...................... 28-29 Lockheed Self-Centering Brake .........................29-33 Bendix Brake................................................................33-35 Huck Brake................................................................35-36 Chrysler Disc Brake.............................................. 36-37 Wagner Self Centering Brakes (Pass.

;* . i IL I SCF-ALLF-01671 Other Volumes in this Series Users of this volume will find much value in its companion volumes.

Industrial Hygiene Dlgeet February, 1956 204 Urinary Lasd Excretion following Treatment with Sodium Calcium Ethylaaa^amiwetetraacctate.

71 f Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING CHEMICAL TOXICOLOGICAL INDUSTRIAL HYGIENE FOUNDATION MELLON INSTITUTE 4400 FIFTH AVENUE -i- PITTSBURGH 13, PA.

1957 National Safety Congress mists, fumes, dusts.

32 TABLE 5 Part III Study o( Combined Cohorts Combined death rates per 100,000 man-years of risk for Asbestos and THctford Mines "Proved" cancer of lung death rate1 per 100,000 man-years of risk 25.S { 9 35271.5 "Suspected" plus proved cancer of lung death rate per 100,000 man years of risk a 34,0 ( 12 . 35271.5 In two, no autopsy was performed but the clinical signs and symptoms were such that the death certificates read "cancer of the Lung", and "suspected lung cancer".

VI.

87. 109.

* Industrial Hygiene Digest August.