An audio transducer having a pair of magnets supported to provide a magnet gap within which a flexible diaphragm supporting an electrical coil is received. The diaphragm is formed of a pair of flexible cylindrical webs joined at their centers to support the coil within the magnet gap. The diaphragm is provided with a row of perforations on either side of the gap to provide flexibility and is aligned centrally within the gap by flexible foam strips attaching the magnets to the diaphragm.

In a VAD method for making optical fiber preforms, the yield is increased by terminating or significantly reducing the supply of glass raw material to the torch (24) just after glass jacket soot (23, FIG. 4) has been deposited at the bottom end of the glass rod (20). The fuel supply to the torch is maintained, however, and the flame continues to be projected from the torch toward the deposited soot boule (23). The rate of vertical movement of the glass rod is increased until the flame is directe...

A battery charging circuit comprising means to supply a DC output from the mains supply for inter alia recharging a rechargeable battery, switch means in series with the battery across the DC output which are normally closed but which open from time to time to disconnect the battery from the DC output, battery voltage monitoring means for measuring the potential or emf of the battery at the time when the switch means are open, and means for determining a maximum potential and therefore fully cha...

A proportioning pump for liquid additive metering having a housing with a diaphragm piston therein and inlet and outlet primary fluid lines to the housing and inlet and outlet valves in the housing for moving the piston up and down. A pair of additive pistons for pumping an additive liquid into the primary fluid with the additive pistons being moved by the diaphragm piston. An overcenter spring loaded connection connects the diaphragm piston to the inlet and outlet valves and a fail safe mechani...

A containment, such as a glovebox (3), includes an extract system comprising an extract suction means, a filter housing (4), and a vortex amplifier (1) controlling the extent of suction by the suction means from the containment, wherein the vortex amplifier is removably mounted in an opening in a wall (2) of the containment, and the filter housing is mounted relative to the containment in such a manner that a filter (22) within the housing can be posted through an opening into the containment. T...

An audio transducer having a pair of magnets supported to provide a magnet gap within which a flexible diaphragm supporting an electrical coil is received. The diaphragm is formed of a pair of flexible cylindrical webs joined at their centers to support the coil within the magnet gap. The diaphragm is provided with a row of perforations on either side of the gap to provide flexibility and is aligned centrally within the gap by tab portions partially cut from the diaphragm and folded to be adhere...

An interactive board game featuring separately actuated game player elements, goalie position and auxiliary player. Improvements to a slapball hockey game are afforded including, among other, a branched bar which is a non-flexible spider element for simultaneously moving a plurality of team players, a recurved rink wall for enlivening game activity, arcuate or sinuous slapper arms meant to emulate hockey player stick and glove apparatus, spring-biased auxiliary slapper units and a redesigned goa...

The washing efficiency of removal of cooking and bleaching chemicals from cellulose paper pulp on horizontal belt washing filters is improved by disrupting the filter mat adjacent the belt intermediately of soft, displacement wash liquor applications to the filter mat topside. The objective may be achieved by directing a line of low volume, high pressure jets of filtrate or wash liquor against the belt underside. Alternatively, sonicly vibrated foils extended transversely of and adjacent to the ...

The main application of this pump is for human heart coronary bypass, cardiac and transplant surgery. A non-occlusion blood pump of peristaltic type and blood pump tube element with pulsating pressure pump delivery, giving similar momentum to blood flow as a natural heart beat, needed to penetrate the capilaries, tiny blood vessels of human body. Most important improvement in this pump is in an especially conceived blood pump tube element which reduces hemolysis of blood by first being partially...

Improvements in a flywheel engine are described which includes a flywheel with non radial propulsion units for generating thrust by combustion to rotate the flywheel in a first direction about a flywheel axis. A drive shaft mounts the flywheel for rotation about the flywheel axis within a housing that completely encloses the flywheel. A turbine is also mounted within the housing. It includes turbine blades positioned to react against thrust from the propulsion units and rotate in a second direct...