In this laboratory, the soil samples are pre-spread, weighed and their grain size determined. The particle size composition can be determined by sieving. For this purpose, sieves with increasing mesh sizes are placed one above the other on a vibrating screening machine, starting with the lower collecting plate for the finest particles. The sieves are set in vertical oscillation by an electromagnetic drive. This results in an even distribution of the sieved material over the meshes. Mass …