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人们在长期同火灾作斗争的过程中,认识到:火灾一旦发生,最好是将它扑灭于初期阶段。这就必须尽早地发现火灾并发出警报,而火灾警报装置正是起这个作用的一种有效手段。过去监视火灾,最常用的方式是设置了望哨;通报火警,除用人来直接传达火情外,还用敲梆子、敲锣、吹瞽笛、号角、打信号、点红灯等声光方式。随着社会生产的发展,这种探火与报警方式,对于迅速发现和警报火灾已不够理想,如现代建筑内部的初期火灾,在烟火未冲出屋顶之前,了颦台是很难发现的。于是,各
In the long struggle against fire, people realize that once a fire occurs, it is best to put it out in its infancy. This must detect a fire as soon as possible and give an alarm, and a fire alarm is an effective means of doing this. In the past, the most common way to monitor fire was to set up a lookout for a whistle. Informing a fire, in addition to using someone to directly convey the fire, use the sound and light methods such as knocking shuttlecock, knocking gongs, blowing whistle, horn, signaling, . With the development of social production, such fire detection and alarm methods have not been satisfactory for promptly detecting and warning fires. For example, the initial fire inside a modern building was difficult to find before fireworks broke out of the roof. So, each