Destructible magnetic switch

Claim 1

IN A MAGNETIC SWITCH, (A) A FIRST FLOAT; (B) A MAGNETIC NEEDLE SECURED TO THE FIRST FLOAT; (C) A SECOND FLOAT; (D) AN ELECTRICAL CONTACT SECURED TO THE SECOND FLOAT; (E) SOLID INSULATION CONNECTED TO THE FLOATS AND INSULATING THE CONTACT FROM THE NEEDLE AND FORMING WITH THE FLOATS, NEEDLE AND CONTACT A TORSIONALLY RIGID UNIT; (F) A CONTAINER HAVING LIQUID ELECTRICAL INSULATION THEREIN ISOLATED FROM THE UNIT; (G) MEANS IMMERSING THE UNIT IN THE LIQUID; (H) THE UNIT BEING FLOATABLE IN THE LIQUID TO ASSUME A POSITION AZIMUTHALLY SUCH THAT THE NEEDLE EXTENDS PARALLEL TO THE LOCAL EARTH''S MAGNETIC FLUIX; (I) THE SOLID INSULATION BEING SOLUBLE IN THE LIQUID INSULATION; AND (J) MEANS INCLUDING THE FLOATS FOR ENABLING THE NEEDLE TO ENGAGE THE CONTACT ON DISTURBANCE OF THE LOCAL TO ENGAGE THE CONTACT ON DISTURBANCE OF THE LOCAL MAGNETIC FIELD WHEN THE SOLID INSULATION IS DISSOLVED.