Casting floats

Claim 1

A CASTING ASSEMBLY COMPRISING IN COMBINATION A CENTRAL BUOYANT FLOAT, A SURROUNDING SINKABLE HOUSING ENCLOSING SAID FLOAT, SAID FLOAT BEING FREE FOR LIMITED VERTICAL MOVEMENT WITHIN AND BETWEEN THE UPPER AND LOWER ENDS OF SAID HOUSING, SAID HOUSING INCLUDING AT ITS APEX, LINEBRAKING MEANS, AND AT ITS BASE, AT LEAST ONE WATER ADMITTING APERTURE AND LINE-LOCKING MEANS, SAID FLOAT AND HOUSIING EACH BEING PROVIDED WITH COINCIDING OPEN-SIDED SLOT INGO WHICH SAID LINE MAY BE INSERTED, SAID HOUSING ALSO INCLUDING A LOWER ENCLOSING PLATE TO WHICH SAID LINE LOCKING MEANS IS SECURED, SAID LINE LOCKING MEANS INCLUDING A PIVOTED LATCH PROJECTING BELOW SAID PLATE, SAID LATCH INCLUDING A CATCH WITHIN SAID HOUSING, SAID FLOAT HAVING MEANS ON ITS LOWER END CO-OPERATING WITH SAID CATCH FOR RELEASING SAID CATCH WHEN SIAD FLOAT BECOMES BUOYANT UPON STRIKING WATER THEREBY RELEASING AN ASSOCIATED LINE TO THE EXTENT IT IS WOUND AROUND SAID HOUSING PRIOR TO BEING LOCKED THEREIN.