Eggs of Schistosoma species in urine are reliably counted in a simple field test involving passing a urine sample of 10 ml or less through a thin transparent microporous membrane having pores of less than about 30 .mu.m, drying the membrane until ready for counting, wetting the membrane with a drop of saline solution, scanning the membrane at about 40X magnification and counting the eggs. Workers of limited skill can run a test in about 1 minute.

Apparatus for generating with AC excitation, a substantially uniform electric field within a predetermined volume, typically in a region of a gas discharge device. The apparatus comprises an electrode assembly including a plurality of elongated electrodes disposed, equidistantly from one another and angularly displaced around a common axis so as to define the region of discharge. An approximately uniform discharge field is created within the discharge region by applying a harmonically varying po...

The disclosure relates to a playing field layout for playing a game with a throwable object of saucer-like characteristics, such as the well-known "Frisbee". The layout comprises a rectangular field divided across its short dimension by a skip court midway between the end lines. This skip court is of hardened material compared to the rest of the field and is of such nature as to cause the thrown object to bounce or skip to the player at the opposite side of the skip court. This player catches th...

Disclosed is a method for staunching blood flow from an acutely bleeding gastrointestinal lesion. The method comprises introducing, into the gastrointestinal tract, a tamponading mass having ferromagnetic properties. A suitable tamponading mass is a mixture of finely divided iron particles and vegetable oil which may be introduced through an endoscopic catheter. Once in the gastrointestinal tract, the tamponading mass is moved as necessary to cover and press upon the bleeding lesion by a magneti...

A rotary electric motor/generator comprising a stator assembly including a single stator having a motor energizing winding and a generator output winding carried by the stator. A rotor is provided rotatable relative to the stator assembly, and includes a rotor winding carried by said rotor. The generator output winding is interconnected with the rotor winding to compensate for rotor reaction when the motor/generator is operating as a motor.

A field effect transistor having a doping concentration profile selected to linearize the relationship between the transconductance of the transistor and the level of a gate voltage fed to the gate electrode of such transistor over the operating range of such voltage. A first doping concentration profile is "spike-shaped" so that the bottom of the depletion zone and hence the transconductance is substantially invariant with gate voltage level. A second doping concentration profile, N(x), varies ...

A rotational field, such as is produced by the rotation of a motor vehicle alternator rotor, has placed therein a conductor coil which is cut by the lines of force, or flux lines, of the rotating field. The coil is wound upon a magnetic strip which in turn is wrapped around the housing of the alternator. The rotational speed of the alternator rotor will cause corresponding pulses in the coil which are received by a circuit which utilizes the pulse rate to control an output.

An electrical connector assembly is disclosed having the capability of being field repairable as well as being assembled in a plurality of configurations by appropriate selection of parts. The assembly includes mating plug and receptacle shells, a pin insert and a socket insert each capable of being received in either shell aligned in a selected one of a plurality of positions and a mating socket terminal and pin terminal each being mountable in either said socket or said pin insert. The connect...

A cathode-ray tube comprises an evacuated envelope having therein a target and an electron-beam-producing means including a field-emission cathode therein. The beam-producing means comprises a plurality of spaced, pointed protuberances pointing in the same direction. Each protuberance has its own field-emission-producing means, a separate focusing-field-producing means for focusing the electrons emitted from the protuberance into a beam and means for modulating the individual beams in concert. T...

A holographic field lens detector system having an objective lens for focusing incoming light from a distant illuminating source upon a holographic lens positioned at the back focal plane of the objective lens. The aperture of the objective lens is simultaneously imaged on four detectors positioned in back of the holographic lens and on the four sides of holographic lens. The output of opposite pairs of detectors are fed to sum and difference circuits with the output of the sum and difference ci...