It's a long, irritating story, but I was walking about 1/2 a mile through the snow up in the hills with open-toed shoes and a short sleeve shirt. I was out for about 40 min and my feet and hands went numb. So, I came back home and wrapped up in a bunch of blankets by the heater, but I'm still really cold and my ears are ringing. Blankets, fire, hot waternothing works.Any advice???
1) Don't waste too much time and energy on who likes you or not. Outcasts is as outcasts does. 2) You could try OSHA; they specialize in workplace safety. The links below are A - a google search on 'osha safety symbols' and B - a site showing lab safety posters. One of this ought to give you a place to start or your symbol to work with.
The following examples would not be a reliable fire alarm system, but would work for the sake of an example. I am assuming this is for strictly educational purposes, and not to be used as an actual alarm. Okay, disclaimer out of the way You basically want 2 elements, a fire sensing element, and an noise making element. It's probably easier to construct something to sense heat over smoke. An old thermostat set at the highest point could serve this purpose. The switch can be used to close a circuit that connects a battery to a motorized bell or buzzer. You could also consider something that a flame would quickly burn away such as a thread that's kept under tension (i.e. Survior television show). You'd have to get inventive so that when the thread is broke you are tripping some sort of microswitch to engage the buzzer. Maybe a spring that's held taught and when it's released it helps to close a switch. If you were simply trying to illustrate something that can respond with a loud noise when exposed to flame how about an inflated balloon? Now for part 2 of your question. How to make a water alarm? I am not sure what you mean by that. An alarm that goes off if there is water backing up? Like if there is a backup in your basement? If that's the case, I think a simple float switch would do the trick, mounted low on the basement wall and connected again to some sort of bell or buzzer with power fed from a battery. Sorry if I am little vague on water alarm, becuase I am not sure what you mean. Good luck.
