What is abcd?
[160] What is abcd? - Author: Nebojsa Jevtovic - #brainteasers #math - Correct Answers: 100 - The first user who solved this task is Djordje Timotijevic
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What is abcd?

Author: Nebojsa Jevtovic
Correct answers: 100
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math
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Musical Arcs

In 1900, Nature reported the Musical Arcs invented by William Du Bois Duddell, an English physicist. By means of an arrangement of electric currents he produced a musical note from an arc lamp that could be altered to any pitch is obtained and a tune played. This may be regarded as the first fully electric instrument. While investigating the noise produced by the operation of carbon arc lamps - anything from a low hum to a high-pitched whistle - he found that adding resonance circuits adjusted the pitch of the sounds. His Singing Arc demonstrated this phenomenon using a keyboard connected to an arc lamp, giving audible results without any amplifier. He toured the country with his Singing Arc, as a novelty performance.«*
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