Abstract: A method of measuring the electric conductivity of body fluids. It uses several test electrodes positioned at various sites at one area of the body to determine electric resistance. The measurements are obtained with a test probe that accommodates the test electrodes. The resistances detected by the test electrodes are polled and the minimal resistance is exploited as a reference for determining electric conductivity. The test probe employed to carry out the method is characterized by a large number of point-shaped test electrodes distributed over the surface of the test probe and associated with the same grounding device.

Abstract: Ultrasound apparatus for determining whether a female large animal, especially a cow or a mare, is gravid, with an ultrasonic head (1) that has an ultrasound transmitter (7) and receiver (8) at one face (9) and with a housing (4) that accommodates a signal generator (28) and a battery (29) or a connection to an external source of electricity for operating the apparatus, whereby the transmitter-receiver is connected to the signal generator and battery or external-source connection by a cable, characterized in that a resilient annular structure (30) that projects beyond the face (9) of the ultrasonic head (1) and surrounds the transmitter (7) and receiver (8) is attached to the head in the vicinity of its face, and a handle (2 & 3) is connected to the outside of the ultrasonic head.

Abstract: An apparatus is provided for livestock obstetrics. The apparatus bears against the body of the dam, a leg sling is placed on the offspring, and two slides can progressively be moved along a rod to tension the leg sling. To move the slides, a tensioning lever is hinged to one slide, and an intermediate lever is hinged at a different location to the one slide and is also hinged to the other slide. The intermediate lever is in two parts normally held together by spring tension, but if an excess load is applied by the tensioning lever the spring tension is overcome and the parts separate, whereby maximum permissible tension between dam and offspring is not exceeded. To completely release the pull on the offspring, the tensioning lever can be moved to release both slides.

Abstract: An improvement for the aeration of the water and combining the aeration with the cleansing of the water by a biological cover, in which one or several circular disks rotate in a clarifying reservoir about a horizontal shaft. These carry at their circumference annularly bent funnels which extend in part above the water surface and continuously converge in direction from the inlet opening to the outlet opening. Above the water surface air enters through the inlet opening into the funnel and below the water surface water enters into it. Because the funnel converges continuously, both water and air are accelerated and compressed in the funnel. The compression assures that the amount of oxygen which is soluble in the water and can be accepted by the same from the air, is substantially increased. The biological cover forms on the disks and on the outer surface of the funnel.

Abstract: An arrangement for converting foreign and harmful matter found particularly in sewage water, in which the foreign matter is converted into harmless materials. A conversion tank with an intake for the water to be treated and having a drain for the treated water, is provided with rotating tubular members with perforations. These tubular members in the form of pipes, emerge on one side completely out of the water, whereas they are immersed on the otherside entirely into the water. The pipes are filled with materials which are insoluble in the water and which have a large surface area accessible to air and water. The pipes are carried by spoked wheels on a shaft, and they are paralel to each other as well as to the water surface. The perforations may be in the form of slots having parallel axes.