Notable early studies of the effect of temperature on acoustic insects were the investigations into the cricket thermometer. The relationship between syllable repetition rate and temperature was first discussed in the 19th century. Brooks (1882) reported a letter to the Salem Gazette where W.G.B. determined that there were 72 "strokes" per minute at 60°F (15.6°C) in a cricket call and the rate increased or decreased four "strokes" for every degree increase or decrease in ambient temperature (ra). She then made a series of observations which showed that the call rate of the local species (which was not identified) was also temperature dependent (Brooks, 1882). Dolbear (1897) took the observations a step further in 1897 and found out that one could determine ra (in °F) by knowing the chirp rate (AO in chirps per minute using the formula
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