herald (plural heralds) 1  A messenger, especially one bringing important news. 2  A harbinger, giving signs of things to come. ( 3 heraldry) An official whose speciality is heraldry, especially one between the ranks of pursuivant and king-of-arms. ( entomology) A moth of the species Scoliopteryx libatrix.
a fire nozzle weighs approximately  ten to fifteen pounds.
This means if a oxygen bottle is leaking, the gas will settle. in low areas before diffusing back into the atmosphere. â¢ 30% oxygen in the atmosphere will cause things to burn or. explode 8 times faster! â¢ in pneumatic tools- the oil and the gas pressure friction can. cause a fire or explosion. â¢ in oil pre-heating burners- these burners are set to burn with.