Farrell, W. E. and McKenzie, D. P. and Parker, R. L. (1969) On a note emitted from a mug while mixing instant coffee. Proceedings of the Cambridge Philosophical Society, 65. pp. 365-367. ISSN 0068-6735 DOI 10.1017/S0305004100044303,Full text not available from this repository.
We have recently observed a curious phenomenon, undoubtedly well known, while mixing instant coffee in a mug. If the bottom of the mug was tapped repeatedly with the spoon as the powder was stirred into the water, the note emitted could be heard to rise in pitch by over an octave. This rise occurred in a matter of seconds, about the same time as it took the mug to heat up. Further experimentation showed that almost any powder could produce the effect in cold or hot water, but water alone would not. Vigorous stirring did not seem essential. A full mug showed as pronounced an effect as a half-filled one.
|Uncontrolled Keywords:||NIL AREP|
|Subjects:||99 - Other|
|Divisions:||99 - Other|
|Journal or Publication Title:||Proceedings of the Cambridge Philosophical Society|
|Page Range:||pp. 365-367|
|Depositing User:||Sarah Humbert|
|Date Deposited:||21 May 2015 10:27|
|Last Modified:||21 May 2015 10:30|
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