As shown in the figure below,a coiled spring would be useful in illustrating any ________ wave. 
Definitions:
Fordney-McCumber Tariff
A set of tariffs introduced in 1922 that raised American import duties to protect factories and farms, leading to increased international trade tensions.
Free Trade
An economic policy that allows goods and services to be traded across borders without tariffs, quotas, or other restrictions.
Banned in Boston
A phrase historically used to describe books, plays, or movies prohibited in Boston, Massachusetts, due to content deemed objectionable; reflects broader themes of censorship.
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