Abstract: A magnetic particle apparatus having spaced relatively movable members with magnetic particles positioned therebetween and electromagnetic field producing mechanism to generate a magnetic field between the relatively movable members through the magnetic particles to establish coupling therebetween, the improvements to such apparatus being embodied in an improved cast iron construction for many parts of the subject apparatus, a more efficient safer apparatus, improved apparatus for circulating cooling air through and closely adjacent to the heat producing components to dissipate heat generated while providing support for the drive cylinder and maintaining the magnetic particles in their most advantageous positions, an improved magnetic gap construction which minimizes flux leakage and increases operating efficiency, including a saturable bridge which enables use of a bobbin of one-piece construction without shunting out flux, and the present construction includes structural members arranged to form a circuitou

Abstract: An apparatus for measuring and monitoring the tension on a web or strand as it extends and/or moves over and around a roll including a support assembly for supporting at least one end of the roll, said support assembly including a bridge structure having spaced connected bridge portions aligned with the roll on opposite sides of the axis thereof, a mounting member attached to anchor one end of the bridge structure in fixed position, a diaphragm member attached to the opposite end of the bridge structure, a mounting structure for attaching the diaphragm member to the roll, at least two and preferably four strain sensitive gage members attached to one of said spaced connected bridge portions, and a bridge type electric circuit including circuit connections to said strain sensitivie gage members.