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
AIR CARS: DREAM AND REALITY
Both at the dawn of the automobile and today, designers - whether amateur or professional - continue to try to set the car in motion using a propeller. For this purpose, both car engines...
TILE — KEY!
To make cutting tile easy method "cleavage", using a common wrench size for the nut which is 1...3 mm greater than the thickness of the tile. To speed the lower edge portion of the key...
