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...burnt that could fly up the chimney and ignite the surface of the thatch. Spark arrestors usually cause more damage than good as they are easily blocked an ...nt or pressure impregnated fire retardant is available that can reduce the spread of flame, and lower the radiated heat output of the fire.

[[Image:WascoCountyCourhouse.jpg|thumb|Perpetrators spread salmonella contaminants on surfaces in the Wasco County Courthouse.]] ...as hospitalized.<ref name="wheelis" /> Afterward, members of Sheela's team spread salmonella on [[produce]] in grocery stores and on doorknobs and urinal han

..."Letters to a Frenchman on the Present Crisis" (1870) stated that "we must spread our principles, not with words but with deeds, for this is the most popular ...b that also killed the Tsar's attacker, [[Ignacy Hryniewiecki]], failed to spark the expected revolution, and an ensuing crackdown brought the group to an e

...first crystal sets received [[wireless telegraphy]] signals broadcast by [[spark-gap transmitter]]s at frequencies as low as 20&nbsp;kHz.<ref>{{Cite book ...e era produced much wider bandwidth signals than modern transmitters, that spread interference over the frequencies of other stations.<ref name="Schaeffer" /