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According to Vintage and Antique Thermometers:
Advertising thermometers first appeared in the 1900s and were widespread in the United States by the 1920s. Intended to be hung outside, the earliest were made of metals like tin, plus wood.
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Traveling salesmen would often come bearing gifts, like beautiful tin or porcelain signs shilling their products, for the owner of the café, gas station, or the five-and-dime to hang at their establishment. Companies like Coca-Cola figured out that if an advertis*m*nt were also a utilitarian object, such as a chalkboard, a light fixture, or a clock, it would stay up at the store longer than an ordinary sign.