Apparatus for warning of the increase in draught of a floating article, especially a small boat, in a surrounding liquid

Apparatus for warning of the increase in draught of a floating article in a surrounding liquid which comprises signal emitting means, current source means, release unit means connected to said signal emitting means and said current source means via relay means and current switch means, said release unit means comprising a chamber fixedly arranged relatively to said article and communicating with said surrounding liquid, said chamber holding a contact means adapted to close an electrical circuit when said liquid has risen to a certain level in said chamber thereby activating said signal emitting means, said contact means being housed in first float means housed by said chamber, the height position of said first float means being adjustable by respectively releasing and clamping a float rod regulatively fixed to said chamber, said first float means thus being locked in position when said float rod is clamped so that said apparatus is ready for use, said chamber incorporating electromagnet means connected via impulse switch means to said current source means, energization of said electromagnet means by closing said impulse switch means causing said float rod to be released enabling said float means to adjust itself to the level of the liquid while deenergization of said electromagnet means by opening said impulse switch means causes said float rod to be clamped.