Tracer liquid release tube having frangible elements at opposite ends of the tube

Claim 1

A SEALED DEVICE CONTAINING AND STORING A LIQUID AND SUPPORTED FOR SUSPENSION IN WATER WHEREIN IT IS MADE OPERABLE BY A RAPID VERTICAL MOVEMENT THEREOF THROUGH THE WATER TO RUPTURE ITS SEAL AND RELEASE INTO THE WATER ITS STORED LIQUID CONTENTS, SAID DEVICE COMPRISING AN ENCLOSURE HAVING A HOLLOW, ELONGATED INTERMEDIATE ELEMENT PROVIDED WITH LIKE OPENINGS AT OPPOSITE ENDS THEREOF, SEPARATE PLUGGING MEANS, EACH PLUGGING MEANS COMPRISING AN EXTENSION AT ONE END THEREOF, SAID RESPECTIVE EXTENSIONS BEING SECURED WITHIN THE LIKE OPENINGS AT THE OPPOSITE ENDS OF THE SAID INTERMEDIATE ELEMENT, INDIVIDUAL FRAGIBLE MEANS, MEANS WITHIN EACH PLUGGING MEANS TIGHTLY GRIPPING SEPARATE ONES OF SAID FRAGIBLE MEANS WHEREBY SAID LIKE OPENING CORRESPONDING TO EACH SAID PLUGGING MEANS IS CLOSED AND THE SAID CONTENTS STORED IN THE DEVICE IS SEALED THEREIN, AND MEANS FIXED TO SAID INTERMEDIATE ELEMENT WHEREFROM THE DEVICE IS SUSPENDED.