National Geographic : 1951 Oct
Div 545 Bob Bailey A "Dope Gang," Masked Against Tarry Fumes, Spins Protective Wrapping Around a Big Incher A hot coat of Bitumastic enamel and glass-fiber mat is applied to this natural-gas pipe beside the Hansford plant of the Phillips Petroleum Company near Guymon, Oklahoma. Some lines wear rag felt and asphalt-impreg nated paper. Both techniques require that dust be removed from the pipe to ensure a strong bond. In addition to mechanical apparatus, old-fashioned feather dusters were used to clean California's Super Inch (page 543).