an alarm bell
An alarm bell is a bell which can be set to alert someone at a pre-set time, or a warning of imminent danger.
Different alarm bells have different frequencies. It seems to us that an alarm sounder could be constructed to sound at any desired frequency between 20 Hz and 20 KHz. Outside of that range, it would have little value as an alarm, because nobody could hear it.
It is used in fire alarm and in earthquake alarm.
An alarm-bell is a bell which is rung to signal danger or emergency, or a bell which is rung at a pre-arranged time in order to mark a desired moment for performing an action such as waking up.
tocsin
A fire alarm is usually the constant ringing of a bell or bells
The same frequency wave as a fire alarm.
Tocsin
it is used in fire alarm .
How do you make a lunchbox alarm????!! How do you make a lunchbox alarm????!! with a luch box cow u put alarm in pig then the pig belches and the bell rings
How do you make a lunchbox alarm????!! How do you make a lunchbox alarm????!! with a luch box cow u put alarm in pig then the pig belches and the bell rings