For those not familure with a bull horn, here's a picture of one I bought a year ago at a swap meet. I tested it on Pat's power supply, but it doesn't work. The amp meter shows a small amount of current flow on 6 and on 12 volts, so I suspect the contacts are corroded. Tomorrow I'll see if I can get it apart and clean the contacts, and try it again. To operate these you just pull the lever down, and the horn will make the sound of a bull calling for it's cow.
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