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”.
.
Recommend to read
MODEL SUBMARINE WITH A RUBBER MOTOR
Submarines — class ships to naval fleets, is designed for attacking ships and land-based enemy targets from a submerged position. They are divided into missile and torpedo. The...
GAS-4
The history of "picaporte" in our country, opened the car GAZ-4 with a lifting capacity 0,5 t, launched the series in 1933. The development of machine production did not require much...
