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From a Ferguson flair valve radio

Gig interrupted before the first song due Brian illness

(c) M Bowers 2010

 

The intensity of the call is on the up-down axis, and the frequency is on the left-right axis. You can see that the loudest part (the hump) peaks at between 4 and 5 on the bottom axis. This is at 45kHz, a Common Pipistrelle.

Gig interrupted before the first song due Brian illness

Gig interrupted before the first song due Brian illness

A London-bound HST pulls into Stroud station. Usually HSTs only call every two hours, but this should be changed to once every hour by 2016.

Cellular Network Transmission Towers on the Main Building, Indian Institute of Technology Bombay.

espectros de frecuencias de ectoplasma

@Frequency Festival, Austria

One of the instruments at Ardnamurchan lighthouse

genug bier für vier stunden ...

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