Old alarm clocks and many doorbells and telephones emit a signal due to the blows of “hammer” metal hemisphere of the bell.
If you are annoying it’s pretty sharp rattling, stick a bell in place of hitting it square of adhesive tape or medical adhesive tape device will beep “whisper”.
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Recommend to read
MIRROR FOR BIRDS
In the second half of the summer birds of the defenders of the orchards and gardens of our loyal friends turn into worst pests, causing considerable damage to crops of fruits and...
THE RETURN OF THE BOOMERANG
40 SECONDS IN THE AIR, THE RANGE OF DIRECT FLIGHT 114 M AND THE TOTAL LENGTH OF THE TRAJECTORY IS ABOUT ONE - THIRD OF THE KILOMETER- THESE ARE RECORD FIGURES RECORDED BY THE...
