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
“LATE TO THE TABLE”
Ships built for combat — the approval that seems quite obvious. However, many warships of various classes and sizes and failed never "smell the gunpowder". Fortunately for mankind in the...
FOR ANY RADIUS
Comfortable and high-performance tool — the jigsaw is much easier and straight and curved sawing of wooden workpieces. Simple Supplement thereto, proposed by the Hungarian magazine...