{"value"=>"<p>A documentary film presented by the Jacobs Manufacturing Company, Engine Brake Division, examining the effects of high levels of sound from machinery, appliances, traffic, and other sources on human hearing. It links loud noise to nervousness, high blood pressure, headaches, fatigue, sleeplessness, and accidents. The film argues for standardized noise levels for trucks, automobiles, and machinery. It also suggests mitigation measures: quiet zones in cities, noise barriers around freeways, and designing quieter machinery.</p>"}