Liquid level signal device for tanks

Claim 1

A LIQUID LEVEL SIGNAL DEVICE FOR ATTACHMENT TO THE FILLER DUCT OF A LIQUID STORAGE TANK COMPRISING A GENERALLY CYLINDRICAL FILLER PIPE, OF SUBSTANTIALLY LESS DIAMETER THAN SAID DUCT, WHICH EXTENDS FROM THE TOP OF SAID DUCT THROUGH AND TO A SUBSTANTIAL DISTANCE BELOW THE TOP WALL OF THE TANK WITH WHICH IT IS ASSOCIATED, A GENERALLY CIRCULAR DISC WITH AN ECCENTRIC HOLE IN WHICH THE TOP END PORTION OF SAID PIPE FITS AND IS SECURED TO FORM A FLANGE THEREON, THE OUTER EDGE PORTION OF SAID FLANGE BEING SUPPORTED ON THE TOP OF SAID DUCT, AN INTRUSION TUBE BETWEEN SAID FILLER DUCT AND SAID PIPE, SAID TUBE BEING SO POSITIONED THAT ITS LOWER END IS DISPOSED BETWEEN THE TOP WALL OF THE TANK AND THE LOWER END OF SAID PIPE AT THE ELEVATION IN SAID TANK AT WHICH IT IS DESIRED TO OBTAIN AN INDICATION OF THE RISE OF A LIQUID FLOWING INTO SAID TANK, A REMOVABLE WHISTLE TUBE ADAPTED TO BE FITTED END TO END WITH RESPECT TO SAID INTRUSION TUBE, AND A WHISTLE MOUNTED ON THE OUTER END OF SAID WHISTLE TUBE.