Abstract: A magnetic stirrer is provided having a minimal overall height so that it is approximately plate-like and flat and its electrical stirring drive formed by magnetic coils is arranged with the driving ends of the magnetic coils approximately flush with the circuit board with the control circuit, wherein the axial dimension of the magnetic coils is smaller than its diameter. In addition, a cover made from non-ferromagnetic material, especially an adhesive film, which tightly seals the housing, is arranged over, and adhered to, the surface of the circuit board and the driving ends of the magnetic coils and lies in a common plane with an outer border of the housing.

Abstract: A device (1) which includes a dispersing and/or homogenizing tool (2) and a pump (7) located on the same shaft (10), wherein a pumpable material can be fed from a receptacle, especially a container (3) or a pipe, to the dispersing and/or homogenizing tool (2). This material can be mixed in the dispersing and homogenizing tool (2) with an additive, which is led through a feeding line (5) and a region (5a) arranged concentric to the supply line (4) to an opening (6) before the dispersing and homogenizing tool (2). The pump (7) arranged at a distance before the opening (6) and before the dispersing and homogenizing tool (2), and has a pumping pressure in the flow direction, which, in the region of this opening (6), is less than the suctioning pressure of the tool (2).

Abstract: A water bath accommodating a calorimetric bomb (2) for measuring the combustion heat of substances with the aid of a calorimeter. The inner tank (3) is enclosed by an outer container (5) forming a water jacket and is shielded from the environment. If several measurements are conducted subsequently, the water found in the inner tank (3) and heated above its initial value through the combustion process taking place in connection with a previous measurement can be at least partially transferred into the outer container (5) with a second or other succeeding measurement prior to conducting it so that at least a part of the combustion heat of the preceding measurement can be used for heating up at least the water jacket in the outer container (5) in connection with the next measurement. Consequently, energy for tempering the water in the water jacket and/or in the water bath can be saved.