Dual purpose drum

Claim 1

A DRUM CONSTRUCTION COMPRISING A CYLINDRICAL OPENENDED BODY, A FLEXIBLE DRUMMING SHEET EXTENDING ACROSS AND CLOSING ONE END OF SAID BODY, SNARES IN SAID BODY EXTENDING ACROSS THE INNER SIDE OF SAID FLEXIBLE DRUMMING SHEET, A FIRST SNARE-SUPPORTING BRACKET FIXED TO SAID BODY AND CONNECTED TO ONE END OF SAID SNARES, A SECOND SNARESUPPORTING BRACKET CONNECTED TO THE OTHER END OF SAID SNARES, A SLIDEWAY MOUNTED IN SAID BODY ADJACENT TO SAID SECOND SNARE-SUPPORTING BRACKET AND EXTENDING LONGITUDINALLY OF SAID BODY, SAID SECOND SNARE-SUPPORTING BRACKET BEING SLIDABLE IN SAID SLIDEWAY FOR BACK-AND-FORTH MOVEMENT OF SAID SNARES TOWARD AND AWAY FROM SAID DRUMMING SHEET, RESILIENT MEANS CONNECTED URGING THE LATTER IN ITS SECOND SNARE-SUPPORTING BRACKET URGING THE LATTER IN ITS DIRECTION OF MOVEMENT TOWARD SAID DRUMMING SHEET, AN ECCENTRIC CAM CARRIED BY SAID BODY FOR ROTATION ABOUT AN AXIS GENERALLY PARALLEL TO SAID DRUMMING SHEET, A CAM FOLLOWER CARRIED BY SAID SECOND SNARE-SUPPORTING BRACKET IN FOLLOWING ENGAGEMENT WITH SAID CAM TO EFFECT SAID BACKAND-FORTH MOVEMENT UPON ROTATION OF SAID CAM, AND ADDITIONAL DRUMMING MEANS EXTENDING ACROSS AND CLOSING THE OTHER END OF SAID BODY.