Dentist: I have to pull the aching tooth, but don’t worry it will take just five minutes.
Patient: And how much will it cost?
Dentist: It’s $90.00.
Patient: $90.00 for just a few minutes work???
Dentist: I can extract it very slowly if you like?
Musical ArcsIn 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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