Abstract: A method for the automatic chromatography of thin-layer plates for thin-layer chromatography with a development chamber 1 in which a thin-layer plate D is completely enclosed, sealed-off and isolated from the external environment. In the development chamber, a front space containing an inner atmosphere is located on the front face of the separation layer of the thin-layer plate. The depth of the front space is about 2 mm and a maximum 3 mm. An inlet is provided at one end of the front space and an outlet is provided at the other end of the front space. During the chromatographic development, a stream of gas of particular composition determined by the user is created throughout the entire front space, the entire inner atmosphere being set in motion, without stagnant or stationary gas phase.

Abstract: An apparatus for applying liquid samples to surfaces, particularly to the separating layer used in thin-layer chromatography and comparable techniques, consisting of a guided pipette which contains the sample, can be placed on the surface with an adjustable contact pressure and which can be removed therefrom again, the apparatus having an electromagnet, the strength of the magnetic field of which can be adjusted so that it holds the vertically freely movable pipette hovering at the required height in relation to the surface, lifts it away from the surface or allows it to rest on the surface under the influence of the force of gravity.

Abstract: A monochromator for the simultaneous selection and utilization of two wavelengths of small and constant band width, whereby the wavelengths may be selected and rapidly changed as desired. The monochromator is particularly suitable for the simultaneous scanning of a chromatogram (e.g. a thin-layer chromatogram) with two wavelengths to determine the concentration of a certain material independently of disturbing influences of the matrix. This is done by photosensors which are adapted to be led on pivot arms on a circular arc about the element dispersing the light.