A two-liquid compensator, i.e. an optical stabilizer based on the use of the interface surface of two liquids, was proposed by M. A. Gusev in 1958. The introduction of the upper liquid layer into the compensator ampoules had the purpose of damping the oscillations of the lower liquid...

Capillary rise of the liquid in the ampoules of stitic compensators can cause deterioration of the image quality of the telescope. To determine the inner radius of compensator ampoules with a large light aperture, formulas have been proposed...

Improving the quality of geological documentation can be achieved by photographing mine workings and then compiling photographic schemes that are used for primary geological documentation. This method is simple, but is possible when the reflectivity of the minerals composing the deposit is known, which makes it possible to select photographic materials and light filters that give the opportunity to obtain the most contrasting separation of minerals on the photo ....