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
SNAKE IN THE POCKET
What a pleasure to start the thread right under the clouds even a simple crossing of two strips, covered with tissue paper! But in our time it is available only to inhabitants of rural...
Will find it even underground
The metal detector I developed has not yet been used in peacekeeping operations to detect and neutralize minefields, nor in large-scale geological or archaeological surveys. Designed not...
