428 CHAPTER 16 1958 Guide return piping preventing return of condensation; (c) valve closed in return line; (d) connection of bottom of water column into a very active section or thin waterway; and (e) improper connections between boilers in battery permitting boiler with excess pressure to push returning condensation into boiler with lower pressure. 4.

732 CHAPTER 28 1958 Guide include enclosure of the pipe and insulation in tile, concrete, steel, or as bestos pipe and then pouring of concrete around outer pipe.

1014 CHAPTER 40 1958 Guide / confined to a channel or duct, the intensity values are averaged over the cross-section.

478 CHAPTER 33 1959 Guide Table 7 ....

JOHNS-MANVILLE INDUSTRIAL PRODUCTS are used instead of Superex Blocks in the range up to 1600 F.

Industrial Hygiene Digest - 12 January, 1950 35 Miniature Chest Roentgenograms In Schools and Industries In San Antonio, Texas.

Officers of the ELECTRICAL EQUIPMENT SECTION NATIONAL SAFETY COUNCIL 1952-53 Chairman--J.

Officers of the METALS SECTION NATIONAL SAFETY COUNCIL 1955-56 General Chairman--E.

1957 .VationaJ Safety Congress This is sheer gain, hot these laws still focus on doing something for the man who has met with an accident, rather than on driving full steam into eliminating causes for accidents.

j^ial Hygiene Digest April, 1957 ol the controls.

Other Volumes in this (1959) Series Users of this volume will find much value in Hs companion volumes, which offer the complete record of the 47th National Safety Congress!

J9S1 National Safety Congress PREVIEW OF SyOE-SCRIPT ON UNDERGROUND HAULAGE SAFETY By HERBERT Ik.

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- ~l * ^ r * i itorf.il>.m PLAINTIFF'S - - EXHIBIT Jf U/7736V April 2, 1956 Dr.

V'" s&sfecar 9, 1950 Dr.